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Humanoid robots really are fighting in San Francisco, but “Humanoid Robots Are Beating Each Other to Pulp in an Underground Fight Club” overstates what is happening: REK’s machines are remotely piloted by humans wearing VR headsets, and the viral DeREK incident was a test malfunction—not autonomous robot aggression.

The image is compelling: two bipedal machines enter a ring, trade punches, stumble, crash, and sometimes need repairs. The reality is less like a scene from a robot uprising and more like a new kind of live entertainment built around teleoperation, virtual reality, mechanical engineering, and the spectacle of machines attempting to do something humans find difficult even without armor: stay upright while taking a hit.

The company behind the best-known version of this concept is REK, short for Robot Entertainment Kombat. REK began as a San Francisco warehouse project and, according to its own current website, has expanded into a multi-city event operation with a simulator, live shows, and international activity. The company’s growth changes the story from a strange viral experiment into an early-stage spectator-sports business—but not into proof that humanoid robots are independently learning to fight.

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Key takeaways

  • REK stands for Robot Entertainment Kombat, a San Francisco company founded by Cix Liv that stages physical humanoid-robot fights for live audiences.
  • REK’s robots are human-piloted through VR headsets and physical controllers; assisted balance or motion software does not make the combat decisions autonomous.
  • The DeREK video showed a robot thrashing while suspended during testing and being damaged after its support equipment failed or descended, not a conscious machine having a tantrum.
  • A September 2025 preview fight used robots reported as approximately 80 pounds and 4.5 feet tall, but those measurements describe that event and should not be generalized to every REK machine.
  • As of August 18, 2026, REK’s website reported 12 events across eight cities, including locations in the United States and Japan; those figures are company-reported and date-sensitive.

What is the humanoid robot fight club?

The “humanoid robot fight club” is primarily a description of REK’s warehouse-born, outsider-sport atmosphere—not evidence of a secret or illegal tournament. REK stages live fights in which human operators control humanoid robots, while spectators watch the machines exchange physical strikes inside a ring.

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REK identifies itself as Robot Entertainment Kombat and presents the format as spectator entertainment rather than a conventional robotics research program. Founder Cix Liv, a VR entrepreneur and robot-fighting enthusiast, has described an ambition influenced by mixed martial arts, professional wrestling, anime, and science fiction. Claims about turning the format into something like the next UFC are ambitions attributed to Liv, not proof that REK has already become an established combat-sports league.

The company’s own current homepage promotes fights, event updates, pilot opportunities, and a simulator. REK’s public presentation now includes a San Francisco shop or headquarters and events beyond the original warehouse setting.

Are REK’s robots autonomous?

No. REK’s fights are human-piloted: an operator wears a VR headset and uses physical controllers to direct a robot remotely in real time. The most accurate description is a remotely operated physical avatar, not an independent artificial intelligence choosing to attack another machine.

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A robot may use software for balance, motion assistance, stabilization, or other low-level functions. Those capabilities matter technically, but assisted movement is not the same as autonomous combat. A control system helping a biped remain upright does not mean the robot selected its opponent, invented a strategy, or decided when to throw a punch.

The distinction is important because promotional descriptions can compress several different technologies into the phrase “AI robot.” A human pilot may make the tactical decision to strike, software may translate the pilot’s movement into motor commands, and onboard systems may attempt to keep the machine from falling. Those are three different layers of control.

REK’s simulator is designed around that pilot-centered model. The REK simulator listing on Steam describes physics-based robot combat, flatscreen and VR modes, online and single-player play, and a possible route toward qualifying as a real-world pilot. The listing describes the game as free to play but also says the simulator is “coming soon,” so the listing should not be read as a guarantee of immediate access or live-event eligibility.

How does a REK robot fight work?

A REK fight combines a pilot, a VR control system, a humanoid robot, a controlled ring environment, and a live event presentation. The pilot sees and directs the robot through an interface, while the robot must convert those commands into movement without losing balance or damaging its own hardware.

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  1. A person operates the robot. The pilot uses VR equipment and controllers to issue movement and combat inputs.
  2. The robot moves in a physical ring. The machine must accelerate, rotate, step, recover, and absorb contact on two legs.
  3. Strikes create real mechanical impacts. Punches, slaps, collisions, and falls can damage hands, joints, covers, sensors, batteries, or head assemblies.
  4. Balance determines what the audience sees. A stumble, missed step, or collision can end an exchange more decisively than a clean-looking punch.
  5. People provide the event structure. Pilots, commentators, venue staff, safety personnel, rules, stoppages, and audience presentation make the contest a mediated sport-like show.

A September 2025 preview covered by ABC7/KGO used humanoid robots reported as approximately 80 pounds and 4.5 feet tall. Both robots fell after stepping on a keyboard placed in the ring, according to the published account of the San Francisco preview fight. The incident illustrates why ring design and floor discipline matter: an obstacle that would be trivial for a human can disrupt a bipedal robot’s foot placement and balance.

Feature What the REK format involves What the format does not establish
Control Human pilots using VR headsets and physical controllers Independent combat decisions by the robots
Movement Software-assisted physical movement and balance Human-equivalent autonomy or consciousness
Contact Real punches, collisions, falls, and mechanical damage Routine destruction “to pulp” or proof of violent intent
Venue Rings, spectators, commentary, and event presentation A clandestine criminal fight club
Competition A developing sport-like entertainment format A mature, universally standardized combat-sports rulebook

What happened to DeREK?

DeREK was damaged during a testing incident in which the robot was suspended from a frame or crane, began thrashing, and struck the ground after the support equipment descended or failed. The footage is a memorable demonstration of instability and test risk, but the footage does not show consciousness, anger, pain, or a robot trying to escape.

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Reports described the sequence as follows: DeREK was lifted or suspended; the robot moved violently; the supporting structure came down or collapsed; the robot hit the floor; part of its head appeared to break or fly off; and people nearby moved away. The widely circulated post associated with the incident was dated July 19, 2025, according to details reproduced in coverage by Yahoo’s syndicated report.

Liv attributed the behavior to the robot lacking the stability cues it normally receives from contact with the ground. That explanation should remain an attributed explanation rather than a proven technical diagnosis. The directly visible facts are more limited: a suspended humanoid robot moved unpredictably and was damaged when the support system no longer kept it safely positioned.

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The DeREK case exposes a basic problem with bipedal machines. A humanoid robot depends on carefully coordinated contact with the floor. Removing that contact changes the dynamics, and a robot that is manageable while standing can behave very differently while hanging, swinging, or partially supported. The incident is therefore relevant to robot safety and control—not to claims that a machine developed a personality.

Why are humanoid robot fights technically difficult?

Humanoid combat is difficult because a bipedal robot has to remain stable while moving quickly, changing direction, absorbing impacts, and responding to delayed or imperfect remote commands. Wheeled combat robots can be designed around a broad, low center of gravity; humanoid robots deliberately accept more balance complexity to produce human-like movement.

  • Dynamic balance: A robot must keep its center of mass within a controllable relationship to its feet while stepping, turning, leaning, and recovering from contact.
  • Teleoperation latency: Any delay between pilot input, network transmission, software processing, and motor response makes precise striking and recovery harder.
  • Force control: A machine powerful enough to hit another robot can place greater loads on its own joints and create risks for operators, staff, or spectators if containment fails.
  • Mechanical fragility: Hands, joints, sensors, covers, batteries, actuators, and head assemblies are exposed to falls and impacts.
  • Unpredictable footing: Uneven surfaces or objects in the ring can cause a foot placement error and a fall, as the keyboard incident demonstrated.
  • Thermal and power limits: Motors, actuators, batteries, and sensors may overheat or run down during repeated high-load movement, although the dossier does not establish specific operating times or failure rates.

These constraints create a trade-off between spectacle and reliability. More force can make an event more exciting, but full-contact action also increases repair needs, downtime, safety requirements, and the chance that a bout ends because of a mechanical problem rather than superior piloting.

Is REK a real sport or a technology show?

REK is best understood as an early-stage spectator-sports experiment that combines real competition with theater and technology demonstration. The robots physically collide, and pilot skill matters, but the format still needs consistent rules and repeatable event practices before it can be compared directly with established combat sports.

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A mature robot-fighting sport would need clearly published rules for scoring, time limits, stoppages, robot inspections, allowable contact, weight or power classes, substitutions, repairs, judging, and the treatment of mechanical failures. It would also need a way to distinguish a successful strike from a robot that simply loses balance, suffers a software fault, or steps on an obstacle.

Robot reliability is another competitive variable. In a conventional boxing match, equipment failure is unusual and normally separate from athletic performance. In humanoid robot combat, a motor, sensor, battery, joint, or control link can determine the result. That does not make the contest unreal, but it means the competition may measure a mixture of pilot skill, engineering quality, maintenance, software assistance, and luck.

REK’s stated long-term concepts have included punches, slaps, and eventually bladed weapons. Those more extreme ideas should be treated as Liv’s or the company’s future ambitions, not as evidence that current REK events routinely use swords or other weapons. The available material establishes live physical robot fights, not a standardized armed-combat league.

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How is REK different from BattleBots?

REK differs from BattleBots-style competitions mainly because REK uses humanoid robots and VR teleoperation, while traditional combat-robot competitions generally use purpose-built wheeled or tracked machines controlled remotely and designed around mechanical weapons.

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Format Typical machine Control model Main spectacle
REK Humanoid robots Human VR teleoperation, with possible software assistance Human-like movement, striking, balance, and falls
BattleBots-style competition Purpose-built wheeled or tracked machines Remote human control Mechanical weapons, armor, and destruction
Autonomous robotics contest Varies by contest Limited or no real-time piloting Navigation, manipulation, or task completion
Robotics research test Humanoids or specialized machines Supervised, assisted, or teleoperated control Mobility, reliability, manipulation, and repeatability

REK belongs to the broader history of robot-fighting entertainment, but REK is not the first robot-fighting format overall. The distinctive proposition is the humanoid body and the feeling that a pilot is inhabiting a physical machine rather than driving a low vehicle around an arena.

What changed between the 2025 warehouse story and August 2026?

REK’s public presentation had expanded substantially by August 2026. The original Futurism report, published on August 13, 2025, described a San Francisco warehouse containing four humanoid robots and a company still developing its concept. REK’s current site now presents an event history, a simulator, a San Francisco shop, and events in multiple cities.

According to REK’s official fights page, the company displayed 12 events across eight cities as of the August 2026 research snapshot. The listed activity included San Francisco, Los Angeles, Las Vegas, Austin, New York, and Tokyo, although event counts, locations, ticket status, and schedules can change. The company-reported total is a useful indicator of expansion, not an independently audited league milestone.

Date REK listing or reported activity What the date shows
August 13, 2025 Futurism published its report on REK’s humanoid robot fight concept The warehouse-era story entered wider public coverage
September 2025 San Francisco preview fight at Bay Breakers Boxing Gym Public reporting documented the VR-controlled physical format
September 26, 2025 REK 0 at Temple Nightclub in San Francisco REK’s official event history lists an early branded event
February 7, 2026 REK 1 at Kezar Pavilion in San Francisco The official history lists a subsequent San Francisco event
July 25, 2026 Tokyo event at Belle Salle Akihabara B1F REK’s official site lists international activity
August 15, 2026 REK 2 at the REK Shop in San Francisco The homepage listed tickets as coming soon when crawled

REK’s expansion does not resolve every question about rules, safety, economics, or competitive standardization. The expansion does show that the concept moved beyond a single warehouse demonstration and into recurring event production.

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Can people attend or become REK pilots?

People interested in attending should check REK’s official event pages because tickets, venues, and availability are date-dependent. The REK website promotes event announcements and invites users to sign up for ticket and fighter updates, including opportunities to pilot at a future event.

The simulator offers a separate participation route. REK describes the simulator as a way for prospective pilots to practice and potentially qualify for live fights, but simulator access is not a guaranteed path to selection. The Steam page’s “coming soon” status also means readers should verify availability before treating the simulator as a currently playable product.

Readers should not assume that any consumer VR headset will work with the simulator or live robots. The supplied sources do not establish a universal headset, controller, computer, networking, or peripheral requirement, so generic VR-hardware recommendations would be speculative.

What is Ultimate Bots, and is Ultimate Bots the same as REK?

Ultimate Bots, formerly associated in the supplied material with the UFB name, is a related but distinct humanoid-robot sports organization. Ultimate Bots describes teams that train, engineer, and pilot robots in live competition, while its official site promotes events, ticketing, streaming, and a motion-creation studio.

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The Ultimate Bots official website listed Season 1: Actuate x UFB in San Francisco for August 18–19, 2026 and promoted a Season 2 concept with a $100,000 prize pool across four permanent teams. The prize figure is a league statement about a planned season, not evidence that the prize had already been awarded.

UFB event materials described human-piloted robots battling in “underground arenas” in San Francisco. That promotional wording likely helped reinforce the underground-fight-club framing, but “underground” in this context describes branding, venue atmosphere, or startup culture. The available sources do not establish that Ultimate Bots and REK are the same company, so the leagues should not be presented as interchangeable.

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What can go wrong during a humanoid robot fight?

The main failure modes are mechanical and operational rather than psychological. A robot can fall without being struck, lose balance when lifted or suspended, misinterpret delayed pilot input, miss a strike because of tracking error, or suffer damage to a hand, head, actuator, battery, or sensor.

  • Uncommanded or difficult-to-stop movement: A control or software fault could require an emergency stop and separation from people.
  • Support-system failure: Cranes, frames, tethers, and test fixtures can introduce hazards, as the DeREK incident illustrated.
  • Impact damage: A fall can be more damaging than a punch because the robot’s weight lands on exposed components.
  • Ring hazards: Objects, uneven flooring, barriers, or poor clearance can undermine balance and endanger equipment or spectators.
  • Operator latency: Delayed or misinterpreted commands can turn an intended step or block into a stumble.
  • Promotional selection: Dramatic footage may show the most spectacular moments while omitting resets, failed bouts, repairs, and stoppages.

Protective barriers, operator separation, controlled test fixtures, emergency procedures, and careful inspection are practical necessities for this type of event. The supplied sources do not provide a complete REK safety standard, insurance policy, or repair-cost schedule, so those details should not be invented.

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What is the business model behind robot fighting?

The confirmed commercial opportunities around REK and similar leagues are event tickets, event-update signups, simulator participation, streaming or on-demand viewing, merchandise, and sponsorship-style entertainment partnerships. The sources do not establish a verified public retail price for a REK fighting robot.

REK’s event pages and terms address ticketing, accounts, purchases, merchandise, simulator use, and championships. REK’s published terms show that the company is operating a public-facing event and digital-service business, although terms of service alone do not prove the size, profitability, or maturity of the operation.

The business faces unusual costs. Full-contact humanoid events require expensive machines, spare components, maintenance, batteries, actuators, trained pilots, suitable venues, barriers, technical staff, and downtime between fights. Larger robots could produce more spectacle but would also demand stronger structures, more power, and more expensive repairs. A viable league must balance dramatic contact against the need to keep enough machines operational for future events.

For readers, the practical choices are limited but real: watch for official REK tickets and pilot announcements, investigate the simulator when it becomes available, or compare REK events with Ultimate Bots’ ticketed and streamed programming. Readers should treat claims about guaranteed pilot qualification, robot ownership, or consumer compatibility cautiously unless an official page states the terms clearly.

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Are the robots actually “beating each other to pulp”?

The robots can collide, fall, and suffer mechanical damage, but the available reporting does not establish that REK machines are routinely being destroyed in brutal autonomous brawls. “Beating each other to pulp” is sensational headline language, not a verified description of the frequency, severity, or cause of damage across the events.

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The strongest evidence supports a narrower conclusion. REK has staged physical, human-piloted humanoid-robot fights; one widely circulated test video showed serious-looking damage after a suspended robot moved unpredictably; and a preview event showed both robots falling after encountering an obstacle. Those facts are striking without requiring claims about robot consciousness or independent aggression.

The more interesting development is that humanoid machines are becoming entertainment interfaces. A person can experience the physical consequences of combat through a robot body, while the event exposes unresolved engineering problems involving balance, latency, durability, safety, and control. The spectacle is real. The robot uprising is not.

Frequently Asked Questions

Are the humanoid robots in REK fights controlled by humans?

Yes. REK’s robots are remotely piloted by humans using VR headsets and physical controllers. Software may assist with balance or movement, but the available reporting does not show autonomous robots independently choosing combat strategies.

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Was the DeREK robot angry or conscious when it thrashed?

No evidence establishes anger, consciousness, pain, or an independent desire to escape. DeREK was suspended during testing, moved violently, and was damaged after its support structure descended or failed; the incident is better understood as a control or stability failure.

Is REK an illegal underground robot-fighting club?

The available evidence does not indicate that REK is a secret or criminal operation. “Underground” mainly refers to the warehouse origins, outsider-sport atmosphere, and promotional style, while REK publicly lists events, tickets, pilot updates, and company terms.

How is REK different from BattleBots?

REK uses humanoid robots controlled through VR teleoperation, emphasizing human-like movement, balance, and physical strikes. BattleBots-style competitions generally use purpose-built wheeled or tracked machines with mechanical weapons, so REK is a distinct format rather than the first robot-fighting competition.

Can I become a REK robot pilot?

REK promotes pilot announcements and describes its simulator as a possible route toward qualifying for live events. Qualification is an opportunity rather than a guarantee, and the simulator’s Steam listing said “coming soon” in the supplied August 2026 research snapshot.

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The Bottom Line

Bottom line: REK’s humanoid robot fights are real physical events, but the robots are not autonomous combatants. Humans are still pulling the strings through VR controls, while balance failures, collisions, and damaged hardware create much of the drama. By August 2026, REK had grown from a San Francisco warehouse concept into a company-reported multi-city entertainment operation, but the format remained an emerging sport rather than a proven robot UFC.

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