Enemy agent Peter Kiri has kidnapped American envoy Carl Wilson and replaced him with an impostor, Gort. Kiri plans to have Gort kill the American Undersecretary and frame Wilson, so a disguised Dan takes Gort's place while the team put Gort in a fake mental institute and convince him he's an accountant who thinks he's a secret agent, so he'll tell them Kiri's plan.
Dan lets himself into a pawnbrokers’ shop after hours and picks up his briefing. Special U.S. envoy Carl Wilson is dealing with an exchange agreement between the U.S. and a neutral country. Peter Kiri, an enemy agent, has kidnapped Wilson and replaced him with an imposter to destroy the agreement. Wilson is alive and a prisoner, so the IMF can’t act against the imposter directly or the envoy will be killed. The IMF must recover Wilson and put Kiri out of action...
This episode was filmed after Steven Hill's departure from the series in "Action!" The opening sequences were filmed months in advance, and Hill's absence in the episode is disguised by having Dan disguised as Gort throughout the rest of the episode.