Cuphead: Don't Deal With The Devil (Hanna-Barbera universe)

Cuphead is an 2018 animated television special based off the run and gun indie video game developed and published by StudioMDHR. Unlike the original game, the characters are drawn in Hanna-Barbera's current art style. The special was produced and directed by Spike Brandt and Tony Cervone at Warner Bros. Animation and Hanna-Barbera Cartoons (in-name only).

Sypnosis
On the fictional Inkwell Isle, Cuphead and his brother Mugman are two fun-loving kids who live under the watchful eye of Elder Kettle. Against the elder's warnings, the brothers wander into the Devil's Casino and play craps. When the brothers go on a winning streak, the casino's manager King Dice calls upon the Devil, who raises the stakes. If Cuphead and Mugman can win another time, they will own the entire casino; if not, the Devil will have their souls.

Trivia

 * Unlike the original game, the special is animated in the Hanna-Barbera animation style from the late 70s/early 80s for unknown reasons.