Doug and Tony transit during a rare off-shift period. As the scientist on duty watches them, a man sneaks up behind him and murders him! Then the man replaces a component in one of the time tunnel consoles. But when the dead scientist fails to check in, security is dispatched to the control room and the man is forced to flee... through the Time Tunnel! Now Doug and Tony are trapped in time with a murderer. Worse, instructions decoded from the man's quarters reveal that he has planted a powerful atomic bomb somewhere inside Project Tic Toc! Doug and Tony must chase the man through time to learn where the device is, before the Project is destroyed and they are stranded!