Dr. Erich Rojak and his wife Anna are being held in an underground laboratory/bunker by a totalitarian enemy government. Another unfriendly government has sent an assassin, Ventlos, to kill Rojak. The IMF must rescue Rojak and his wife, destroy the test missile Rojak is working on, and stop Ventlos. The IMF infiltrate the base and Jim introduces a handstamp system, unaware that Ventlos has already replaced the bunker's security chief. Jim uses his system to expose security officer Cinnamon as a phony and she is imprisoned near Anna. Willy breaks in via the furnace and rescues Anna while Cinnamon takes her place...

With Cinnamon-as-Anna in place, she is taken to her ""husband"" and tells Dr. Rojak to be near an air vent. Jim as a security officer has placed a small remote-control flying disk in the bunker's air vent system and it holds a hypo. Barney steers it to Rojak's monitored cell and he uses the hypo to induce a heart attack. Jim summons Rollin (as a heart specialist) who advises surgery and instructs that ""Anna"" be at her husband's side. Ventlos the assassin plans to disrupt the operation by taking Rollin's place in disguise and the IMF quickly has to readjust when Ventlos tries to kill Rojak and destroy the installation.