Dumbo

Dumbo was a robot created by Bellboy, originally for the Psychic Circus. It had large claws and could shoot lasers from its eyes. After the Psychic Circus was trapped on Segonax, Dumbo was abandoned and buried. Years later, Ace and Mags accidentally reactivated Dumbo, and Dumbo grabbed Mag's leg, and shot its lasers. The Seventh Doctor tried to free her with his umbrella, but Ace deactivated it by hitting it in the head with a shovel. Later, Bellboy gave her a remote that controlled Dumbo, and she used it to kill the Robot clowns, and the Chief Clown. (TV: The Greatest Show in the Galaxy)

Behind the scenes
It can be surmised that Dumbo was named after the titular character of the.