Bimbo and Betty Boop introduction Fleischer Studios 1931. Story behind this - Bimbo's Initiation is a 1931 Fleischer Studios animated short film starring Bimbo and featuring an early version of Betty Boop with a dog's ears and nose. It was the final Betty Boop cartoon to be animated by the character 's co-creator Grim Natwick. Fleischer Studios, Inc., was an American corporation which originated as an animation studio located at 1600 Broadway, New York City, New York. It was founded in 1921 as I