The kids get zapped into a backyard world where they become military action figures.

Phil and Rippen tunnel into The Odyssey and damage the Multi Universe Transprojector, causing unbalance in the multiverse. Vortexes form in every world that Penn and his team have visited. Penn, Boone, and Sashi must travel to each world and close all of the vortexes before everything and everyone from all the worlds get sucked into nothingness. During their mission, Penn finds a crystal shard in the nothingness, which, according to Phyllis, is the key to finding his parents.