The Frog Prince is a classic fairy tale (most famously told by The Brothers Grimm) about a princess, who befriends a frog that's actually a prince under a spell. In most versions, the spell is broken by a kiss between the two. Since the most well-known Muppet character is a frog, references to the story are often made in various Muppet productions. The most substantial was the production of the story with the Tales From Muppetland special, The Frog Prince.