Raphael wins a ticket to a costume party on MacDonald Crump's yacht and decides to go disguised as a Teenage Mutant Ninja Turtle. April and Vernon are also attending the party for the TV station. As Raphael boards the yacht, a woman in what appears to be a female mutant costume shows up, grabs his arm and pretends to be his date. Raphael discovers that the women's name is Mona Lisa and she is a mutant just like him. He gets suspicious of her when she tells him that a pirate named Captain Filch is going to hijack Crump's yacht and hold it and its passengers for ransom. Soon after, the yacht is hit by a force field, stopping it in the middle of the ocean. Raphael begins to believe Mona Lisa when he sees Captain Filch and his anemone guards board the yacht. The two mutants, along with April and Vernon hide away from the Captain. While in hiding, Mona Lisa tells them how she was transformed into a mutant by Filch. She swore to get revenge on the Captain for what he did to her and that's wh
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