Stok is a yellow Woodstock bird who rides along with his partner, Harvax, on a garbage can against Sylvia and Wander who races in the speedway Galactic Conjunction 6000 in the episode, The Time Bomb. Harvax and Stok both tease Sylvia about her nickname "The Time Bomb", due to the fact she rages when she gets competitive.
Stok, as his name applies, is a yellow woodstock bird, who is always in a trash bin. He has green teeth, red circles around his eyes, ruffled feathers and has stubby arms and legs.