When Tom's harassment gets out of hand, Jerry writes to his Cousin Muscles, a tough inner city mouse, and asks for his help.
| Visual Effects | Ed Barge | Animation |
| Visual Effects | Ray Patterson | Animation |
| Visual Effects | Irven Spence | Animation |
| Directing | Joseph Barbera | Director |
| Sound | Scott Bradley | Original Music Composer |
| Directing | William Hanna | Director |
| Production | Fred Quimby | Producer |
| Visual Effects | Kenneth Muse | Animation |
