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Peach-bots are robots that appear in the Game Boy Advance game Mario & Luigi: Superstar Saga. They were created by the evil witch Cackletta and her accomplice, Fawful. The Peach-bots are made to look like Princess Peach and are programmed to play a perfect copy of her voice, which was stolen during the events of the game. Cackletta intends to use the voice to awaken the Beanstar, a magical object which is said to grant wishes and fulfill anyone's greatest desires. Cackletta and Fawful go to Woohoo Hooniversity in secret to awaken the Beanstar, where Fawful is making some final adjustments to one of the three Peach-bots. He then gives the cue to Cackletta to activate them. For a few seconds, everything seems to be going to plan, but instead of peacefully awakening the Beanstar, it becomes very angry and crashes around the area, creating holes in the floor, which the Peach-bots fall through.
Later, when Mario and Luigi investigate, they find the Beanstar breathing hard on the floor, but it seemed to be recovering. However, a Peach-bot which didn't quite make it to the floor then falls, and its voice sets off the Beanstar again.
It is revealed later on that the stolen voice belonged to Birdo, as the Princess was switched before Cackletta and Fawful stole her voice. This explains why the Peach-bots' voice drove the Beanstar mad, instead of awakening it as planned.