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Bestimus Muchos is one of the transforming robots that appears in Treehouse of Horror XIX and leader of the Posi-Bots. It was originally a toy truck found by Bart Simpson, then quickly transformed into a Malibu Stacy car to persuade him to take it home and give him to Lisa as a Christmas Present. One night, Bestimus Muchos shot beams of light from his eyes and turned many of Lisa's room electronics and more of the Simpson house-hold electronics into more Posi-Bots for his army.

Just before his final battle with the White Bot Leader, Marge asked what they were fighting over. Since neither of them could remember what they were fighting over, they decided to team up and enslave the Earth.

Bestimus Muchos/Malibu Stacy car resembles a Ferrari F430 Spider.