Steve, Dan, Valerie and Fitzhugh are caught by a mad scientist named Melzac who puts them in a model plane and flies it to the "Graveyard of Fools"—an uncharted land on the giants' world that no one has ever returned from. During the flight, the plane enters a mysterious vortex and vanishes along with the little ones who find themselves in a bizarre world under the control of Melzac's twin brother Bryk. Meanwhile, Mark is caught by Melzac who reveals he and his brother plan to fix an alien device, the "servo actuator", which is causing ripples in space and time and requires the use of the little ones to get inside it and conduct repairs.