Like most of the Kroffts’ productions, the show’s opening sequence provides the setup of its fanciful premise: While loading food into various compartments to prepare a rocket for an upcoming mission, Barney instructs Junior to hit the “lunch” button, but Junior mistakenly hits the “launch” button. The rocket blasts off and takes them on various misadventures on alien planets.

The show starred Bob Denver as Junior, a seemingly dim-witted but uniquely clever maintenance worker employed by NASA, and Chuck McCann as Barney, his grumpy, short-tempered co-worker. Patty Maloney played Honk, their furry friend who made horn sounds instead of speaking.