Occasionally throughout Robot Wars, the winners of a battle were unable or unwilling to proceed. In these cases, the robot they defeated would be Reinstated. The reasons for robots being reinstated varied. The first instance occurred after the Heat Final of Heat D in Series 3, where Ultor handed their victory over to Big Brother after considering the judges' decision to be unfair. The most recent example occurred in Episode 1 of Series 9, where Rapid withdrew from the Head-to-Head rounds due to suffering terminal damage, and was replaced by Jellyfish.