Kung Fu Panda: Legends of Awesomeness S01E12 - Rhino's Revenge

On Dragon Warrior Day, Po befriends a bitter rhino named Hundun and helps him get back on his feet—until he learns that Hundun's secret goal is to destroy the Dragon Warrior. Po learns that Hundun is bitter about the day when Tai Lung escaped from Chor-Gom Prison (where Hundun used to work at) and Tai Lung's defeat leaving him without a job.

Villain: Hundun

Note: This episode takes place before the series premier due to Chor-Gom Prison being opened after Hundun's defeat.