Tom and Jerry, Ep58 - Sleepy-Time Tom (1951)

"Jerry's Cousin" (fragment), is a 1951 one-reel animated cartoon and is the 57th Tom and Jerry short on April 7 by Metro-Goldwyn-Mayer, the cartoon was directed by William Hanna and Joseph Barbera, produced by Fred Quimby, scored by Scott Bradley, and animated by Ray Patterson, Ed Barge, Kenneth Muse and Irven Spence. Working titles for this particular cartoon included "City Cousin" and "Muscles Mouse" before settling for "Jerry's Cousin".
Interesting facts:
First appearance of Muscles.
"Jerry's Cousin" was nominated for the 1950 Academy Award for Best Short Cartoon, the duo's eighth consecutive nomination and tenth overall, but lost to Gerald McBoing-Boing, a UPA production.
The character of Muscles makes a reappearance in "Tom and Jerry: The Magic Ring. However, unlike his debut appearance, his name has been changed to Freddie and he was hostile to Jerry.
On Boomerang, the scene where Muscles blows the bullets on Tom's eyes to make them look like bloodshot is edited out.
Paul Frees as Jerry's cousin (Muscles).