Land of the Giants

Dan and Mark are sucked up in a vacuum-cleaner like machine by Bolgar and Zarkin, both of Police Security. Mark's shoulder is injured, and he is unable to later escape with Dan. Bolgar plans to frame the Earthlings for an explosion to raise public opinion against them, discredit the pro-Earthling Senator Obek, and increase his own political power.

Dan and Steve help Mark escape, then follow Bolgar's assistant Zarkin and watch him plant evidence. Steve lets himself be captured, and while Bolgar is speaking on the radio Steve tricks Zarkin into confessing while a tape recorder is playing. Mark lures Zarkin away while Steve and Dan call Senator Obek, who arrives and puts the two men away for good.