Family Guy (1999)

S6E3 Believe It or Not, Joe's Walking on Air

Joe begins to worry that his disability is preventing Bonnie from enjoying life to the fullest, prompting him to undergo a leg transplant. Thrilled with his newfound ability to walk, he dives into extreme sports and starts distancing himself from his old friends in favor of a more adventurous crowd. Peter and the others become concerned about Joe's behavior and resolve to show him the consequences of his actions.