Tom has amnesia and believes he's a mouse. Jerry, finding him more obnoxious as a fellow rodent than as a cat, seeks to cure him with a blow to the head.

June Foray
as Tom's Squeaks (voice) (uncredited)

William Hanna
as Tom / Jerry (voice) (uncredited)

Lillian Randolph
as Mammy Two-Shoes (voice) (uncredited)