Donnelly was a writer, director and animator for Disney, Terrytoons and Van Buren studios.
In a departure from the usual Terrytoon, this short is based on predictions of things to come in the world after the end of World War II. It primarily deals with, in a comedy sense, what every "G.I." Jonnny can expect when he returns home to civilian life.
The origin story of Super Mouse (later changed to "Mighty Mouse").
Heckle and Jeckle know something other animated toilers don't: they're cartoons. That means unlimited power, which they use to outwit a bulldog cop.