He remained unnamed in all few of his appearances, and also never spoke. He appeared in "Turtle Tracks", under the orders of the Shredder and the leadership of Rocksteady, tried to kill April O'Neil. Eventually, the Turtles showed up and he was thrown to a wall along with Bebop and defeated. He later reappeared in "Hot Rodding Teenagers from Dimension X" as a mutant shrew with a curled up nose, and made one final appearance in "Shredder and Splintered" behind bars with Scrag, Grunt and Dumbo. All four were inside the Technodrome when it was sucked into Dimension X.
He was omitted from several adaptations of Season 1, as he was not present in the coloring books or the Teenage Mutant Ninja Turtles Adventures comics.
- His name "Dopey" comes from an official storyboard of "Turtle Tracks".
- Similar to Bebop and Rocksteady, who are both named after musical styles, Dumbo and Dopey share a naming scheme, with both punks having names of characters from early animated Disney films.
- Previously, he had been referred to as "Sailor Punk" or "Hat Punk" by the fandom.