Bad Polly, sometimes called Polly Lobster, is Long John Silver's crustacean companion in Muppet Treasure Island. Polly is a lobster whom Silver "raised from a fingerling". He works closely with fellow pirates Clueless Morgan and Mad Monty to cause trouble for the heroic crew of the Hispaniola. He steals the map to Treasure Island, and is eager to start a mutiny.
Polly and Clueless Morgan were also featured in several UK Spots on Muppets Tonight, interacting with Mr. Callahan. They also appeared alongside Mad Monty in the Muppet Sing-Alongs: Muppet Treasure Island video.
In books, Polly made appearances in the literary adaptations Muppets Meet the Classics: The Phantom of the Opera and Muppets Meet the Classics: Fairy Tales from the Brothers Grimm. In the latter, he stars in the story of "Pepe and Polly," referencing Hansel and Gretel.