Crab-Bots are an army of robots created by Dr. Crab.
Dr. Crab had his Crab-Bots in his asteroid base where they fought against Radioactive Man after he broke out of his stasis chamber. Radioactive Man easily defeated them and Dr. Crab.
Later, Dr. Crab used his Crab-Bots to attack the Mando Building and the Superior Squad. The Crab-Bots overwhelmed the Superior Squad and would have killed them if Radioactive Man didn't come back from the dead. Radioactive Man defeated the Crab-Bots and Dr. Crab.