Brian Doyle-Murray, Marva Hicks, Farrah Fawcett, Jim Cummings
Robbie, the master's baby, has been mysteriously beamed to Mars. It's up to our heroes plus a houseful of new friends - a fan, microwave, calculator, bag of cheddar-flavored popcorn and "the contraption in the junk drawer"- to reach for the stars and bring him safely home.