Kirby - The Fifth Turtle
Kevin Eastman, co-creator of Teenage Mutant Ninja Turtles (TMNT), has auctioned off several sketchy looking rough drafts for a proposed but never produced fourth film in the series. Among the new characters was a fifth turtle. Like his brethren, he was named after a famous artist, comic book legend Jack Kirby.

“The fourth live-action TMNT film was pitched and originally scripted as a grittier, less kid-friendly adventure, and to that end Kevin Eastman designed a more brutish, hardcore fifth Turtle, named for the legendary King of Comics (Jack Kirby),” reads the description by Heritage Auctions.

The movie, tentatively titled Teenage Mutant Ninja Turtles: The Next Mutation, eventually mutated into the 90s live-action TV series with the equally ill-conceived female turtle, Venus de Milo.