He only appeared in the episode "Bad Po," where he, along with Fung and the Croc Bandits, tried to take over the Jade Palace and destroy Master Shifu and the others. In the end, Good Po defeated him by making him look at the Mystical Mirror of Yin and Yang, thus killing him once and for all.
Bad Po was voiced by Mick Wingert.
As the physical manifestation of Master Po's evil nature, Bad Po was purely evil in all intentions. As described by Master Shifu, Bad Po possessed all the qualities and traits of regular Po's Dragon Warrior side (often used when he fights) — of such include aggression, indignation and impatience.