comments disparagingly on the choice, but relents when Lisa points out that the same had previously been done for him. Homer defeats numerous opponents and makes it to the finals, despite being injured from the battles with the other robots. In the final match against Professor Frink's undefeated super-robot, an ED-209 look-a-like, Bart finds Homer in the bot after the grueling first round. Caught, Homer apologizes to Bart, but Bart is impressed because of all the pain Homer went through to win his son's admiration. In the second round, ED-209 squeezes Homer out of the robot, but immediately stops as soon as it sees him. Frink explains that the robot follows Isaac Asimov's Three Laws of Robotics and has been programmed to serve humans rather than harm them. ED-209 sets out a chair for Homer and pours him a martini. Homer wins the match (although one of the commentators points out that the first rule from the tournament's rulebook disqualified any human combatants) and Bart is proud of him. Cultural references The title of the episode includes the phrase "(Annoyed Grunt)" which is how Homer's catch-phrase "D'oh!" is written in episode scripts. Making the episode title read "I, D'oh-bot" - a play on Isaac Asimov's I, Robot as well as the sci-fi action movie of the same name released later the same year. Robot Rumble parodies the robot combat shows Robot Wars and BattleBots. Homer's robot, Chief Knock-a Homer, is a reference to the former Atlanta Braves mascot Chief Noc-A-Homa. The song playing while Bart and Milhouse are cycling is "Magic Carpet Ride" performed by Steppenwolf. During one of the Robot Rumble matches, one of the commentators states that one robot is "killing him softly with his saw," a reference to the Roberta Flack song. Dr. Hibbert has a Kool and the Gang air-freshener in his car. The song playing during the Robot Rumble montage is "Watching Scotty Grow" performed by Bobby Goldsboro (The same song played in the Season 3 episode "Saturdays of Thunder" as Homer was helping Bart build a soapbox racer). Homer also sings part of this song when delirious from blood loss and a concussion. One of the robots advertised for Robot Rumble is the T-800 endoskeleton from the Terminator film series. Professor Frink's robot is named 'Smashius Clay' a.k.a. 'Killhammad Aieee', based on the boxer Muhammad Ali and his birth name Cassius Clay. Professor Frink's