The sixth BattleBots tournament continued the partnership with the Comedy Central cable network. BattleBots season 4.0 was filmed November 4 - 11, 2001 at Treasure Island - San Francisco, California.

This event continued the practice of allowing veteran ranked competitors to gain an advantage by sitting out the early rounds of the tournament. More than half of the 'round of 32' slots were reserved for ranked 'bots.

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401(k), A.W.O.L., Ack Ack, ACME Surplus Fighting Robot, Afterburner, Afterthought, Agsma, Alpha Crusader, Backlash, Bad News, Bait, Bambino, BatRay, Big Stick, Blood Moon Mark II, Botilla the Hun, Bulldog, Burning Metal, Bust-O-Matic, Carnage Raptor, Chewy, Chimera, Claymore, Cleprechaun, Cold Chisel, Concretor, Crashius Clay, Critical Condition, Crusher, Daisy, Das Bot, Death By Monkeys, Death Ray, Dialmondback, Dr. Inferno Jr., Dracolich, Dude of Destruction, Eric The Red, Fang, Firestorm, Gamma Raptor, General Gau, Gerbilov, Herr Gepounden, Hexy Jr., Jack The Flipper, Jo Mama, Junkyard Dog 2.0, Killer Stash, Land Mine, Learning Curve, Little Engine That Killed, Little Hater, Little Piece of Hate, Little Punch, Little Wicked, Lobotomizer, Locomotion, Low Blow, Manic Aggressive 2.0, Matts Bammer, Mouser Classic, No Tolerance II, None Shall Pass, Nsyncerator, Paladin, Project Y.A.W.N., Pursuer, Rama Lama Ding Bot, Rambite, Ramming Speed, Rhode Hog, Rim Tin Tin, Robo Master, RoboMisDirection, Robot X, Rolling Blackout, Sallad, Scrap Daddy's Surplus, Serial Box Killer, She Fights Like A Girl, Shockwave, Skid Mark, Slap 'Em Silly, Snowflake, Some Parts, Space Madness, Speed Bump, SupercaliBotulistic, T.D.M., Tentoumushi 7.0, The Big B, Tiki Fire, Toe Crusher, Trilobot, UGV Scorpion, Vermicous Kenid, Wedge of Doom, Wedge-O-Matic, Wham! Bam!, Whirl Wep - EEL Brain, Whirligig, YU812, Ziggo