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The IMF is assigned to cure a computer virus that is capable of sinking the US Navy's entire submarine fleet. But when the only antidote to the virus is destroyed, the agents resort to "Plan B" --- which requires the assistance of a brilliant Hollywood art director. Mitchell Ryan guest-star as Admiral Sheppard, an ex-navy man turned traitor. Written by Dale Duguid and telecast on April 29, 1989, "Submarine" is an updated remake of the 1969 Mission:Impossible episode of the same name; the earlier version was scripted by Donald James.