Kitty from Kansas City (1931)

Sun bonneted Betty Boop takes a train to "Rudy Valley" where she gains weight and Rudy Vallee performs the title song with Bouncing Ball. IMDb.

Mask-A-Raid (1931)

Betty Boop is queen of the Masquerade Ball where, among other antics, Bimbo and a lecherous old man vie for her affections. IMDb.

Minding the Baby (1931)

Bimbo's minding his baby brother, but neighbor Betty Boop (with dog's ears) wants him to come over and play. IMDb.

Silly Scandals (1931)

In a vaudeville act, Betty Boop (with dog's ears) sings "You're Drivin' Me Crazy;" Bimbo sneaks into the show and runs afoul of a stage hypnotist. IMDb.

The Bum Bandit (1931)

Masked bandit Bimbo holds up a train carrying someone tougher...Betty Boop (with dog's ears), played by a different, deeper-voiced actress. IMDb.