Lion is a character who first appeared in "Jerry and the Lion". He escaped the circus due to how much he hated being treated there. It was reported on the radio that he escaped, and he hid in Tom and Jerry's house. He tells Jerry to not give him away and that if he is taken back to the circus, he will go crazy because he can't stand the corny music or the crackle of popcorn bags. He asks Jerry to help him get back to the jungle and Jerry accepts. He tells Jerry that he is hungry and eats a large ham with Jerry's help. He escaped on a ship to Africa, but not before saying an emotional goodbye to Jerry.
Tom and Jerry
The Tom and Jerry Show
Tom and Jerry Tales
War of the Whiskers
Lion appears as a challenger, and is only the opponent once. He is the strongest of the 11 characters. Ironically, he fights Jerry twice (normal Jerry and Monster Jerry), the mouse who was his best friend.