When Tom's harassment gets out of hand, Jerry writes to his Cousin Muscles, a tough inner city mouse, and asks for his help.

Paul Frees
as Cousin Muscles (voice)
CinemaSerf
With “Tom” in possession of what looks like a lifetime’s supply of dynamite, “Jerry” is besieged in his home and so sends for his no-nonsense cousin “Muscles”. He is a veritable terror when it comes to dealing with errant cats, so within five seconds of arrival he has firmly put “Tom” in his place. ...