Penn Ward, Max Winston and others guest direct "Uncle Grandpa".

"Uncle Grandpa" stop-motion short directed by Max Winston. (Click to enlarge.)

The Cartoon Network series "Uncle Grandpa" will release a new 11-minute episode tomorrow, May 21.

The omnibus episode includes:

Three mini-episodes and a cross bumper, each with its own personality and plenty of unabashed cartoon fun. Penn Ward's is the quirkiest, and his version even includes the voices of Uncle Grandpa and Pizza Steve, but the standout piece is Winston's "Total Reality," in which Uncle Grandpa uses the power of imagination to enter his mind.

Winston, drummer for the band Manx, is joined by Uncle Grandpa's staff of board artist Myke Chilien and animation timer/music composer Tommy Meehan. His talents have been glimpsed in the occasional stop-motion snippets of his various commercial projects, but with this five-minute Uncle Grumpa, he finally has the luxury of directing his own mainstream project. Winston more than lived up to those expectations, creating a satisfyingly ridiculous short film.

Below are clips from Winston's short film. All episodes will air tomorrow at 5 pm ET/PT.