Space Ace (voiced by Jim Piper) is the always smiling self-confident champion of the "Space Command", whereas when always "wimping out" to Dexter (voiced by Sparky Marcus) after being hit by the Infanto-Ray, he becomes clumsy and weak. With officer Kimberly (voiced by Nancy Cartwright), he works for Space Marshall Vaughn (voiced by Peter Renaday) to keep the peace in the universe. They fight the evil alien commander Borf (voiced by Arthur Burghardt) and keep him from invading Earth. Ace and Kim try to keep his 'wimping' situation secret and pretend that Dexter is Kim's little brother to Vaughn.