Land of the Giants

Dan and Mark duck into a laboratory to avoid Kobick and hide in an experimental guidance unit, and almost get fried. Steve helps them to escape, but Mark overhears head scientist Franzen and his wife discussing their plan to use the unit to travel to Earth. Mark is convinced he can bargain with them for transportation in return for his scientific assistance, and Valerie and Fitzhugh agree to help him.

Franzen's supervisor Logar and Kobick disagree on the use of the little people. They secretly agree to have Mark provide help and then take him into custody. Franzen's wife feels the Earthlings will steal the credit from her husband, and tries to kill them. They manage to escape that fate, although Fitzhugh's hands are badly burned.

Mark needs more assistance and sends Fitzhugh and Val to get Dan and Steve. The two are captured anyway, but Franzen insists they will be freed and offers to let them go. Dan and Mark accept his offer and succeed, and then are betrayed by Logar. Shocked, Franzen attacks Logar as the Earthlings set the self-destruct sequence on the guidance unit. They escape as Logar is electrocuted and then Franzen is blown up in the explosion before he can get away.