Medusoid

The Medusoids were a race of aliens, described by the Doctor as looking like "som sort of hairy jellyfish, with claws, teeth and a leg."

The Doctor was once captured by a group of Medusoids, who used several mind probes on him in an attempt to find out where he was going. The Doctor managed to short out every one of the Medusoid's probes (by telling them: "I'm on my way to meet a giant rabbit, an pink elephant and a purple hourse with yellow spots."), forcing them to release him. (DW: Frontier in Space)