Plumbers' Helpers

A pair of rogue plumbers, a female Kinceleran named Helen and a male Tetramand named Manny, kidnap Kevin, believing him to be an alien. After his rescue, the two sides work things out. After looking at a database of the aliens they captured and put into the Null Void, Ben realizes that some of them may have been Plumbers' kids. To make things right, the duo set out into the Null Void to rescue those they wrongfully imprisoned.