Jerry's Cousin is a 1950 animated short film (7½ minutes) directed by William Hanna and Joseph Barbera.
It's a Tom and Jerry short. The film starts with one Muscles Mouse kicking the bejesus out of all the cats in "Hogan's Alley". Muscles gets a letter in the mail from his cousin Jerry, pleading for help. Muscles arrives to find Jerry cowering behind his dinner table as Tom chucks dynamite stick after dynamite stick into the mouse hole. The tables are rapidly turned as Muscles the super-mouse goes after Tom.
- Aside Glance: Jerry's triumphant smile at the camera at the end, after Tom, who thinks that Jerry is Muscles, meekly kisses Jerry's feet.
- Elite Mooks: Tom recruits a gang of three intimidating tough-guy cats to take care of Muscles. Muscles beats all three of them senseless, after which Tom surrenders.
- The Hunter Becomes the Hunted: Tom gets in a lot of trouble as soon as Muscles shows up.
- Inflating Body Gag: Muscles blows up his fist to a comically large size in order to punch Tom across the room.
- The Juggernaut: Muscles. None of Tom's tactics work and no other cat, including Tom or the three thugs, can physically match Muscles.
- Metronomic Man Mashing: Muscles is introduced rhythmically slamming cats back and forth by the tail in Hogan's Alley. He later does the same to Tom.
- Punched Across the Room: Muscles inflates his hand to monster size and then punches Tom across the room and into a flower vase.
- Tempting Fate: Muscles is airily saying, "Relax, cousin, nothing's gonna happen," when Tom drops a bowling ball on him from the attic. He comes back soon.
- Uncanny Family Resemblance: Muscles and Jerry look exactly alike. This allows Jerry to impersonate Muscles and get the advantage over a terrified Tom.