To escape war, humanity takes a drug that kills emotion. But insurgents, including the returning astronauts from a mission to Mars, refuse to take the drug and wage an armed rebellion. The Freedom Army, which includes the Physicist Burges, is besieged in a bunker. However, Burges constructs a gateway to another dimension-an alternate existence-and ex-space pilot Lanson leads their escape ... only fo face an alternate world where humanity is enslaved by a toad-like alien race, the Zytlen!