The Monster

The Monster is an unseen character whom Robin believes resides in the kitchen. The monster was mentioned in Episode 5, when the new Robbin says, "Batman, I think there's a monster in the kitchen!" In Episode 11: The Scare Crow, Robbin mentioned the Monster when he said, "Batman, there's a monster in this cave!" But it seems that Batman doesn't believe in the Monster.

Trivia

 * In Episode 11, the Monster can clearly be heard making noises before Robbin leaves the Batcave, implying that the monster really does exist.