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A rare radioactive isotope known as Trivanium is the prize in this tense Mission:Impossible episode. With only 48 hours at their disposal, the IMF must recover the isotope before it can be applied to the manufacture of nuclear weaponry. Paris poses as Stefan, the amnesiac former partner of Johan (Steve Ihnat), the thief who stole the Trivanium--and who thought he'd murdered Stefan in the process.. Also in the cast is Julie Gregg as IMF agent Monique. First telecast on December 21, 1969, "The Amnesiac" was written by Scripted by Robert Malcolm Young and Ken Pettus, from a story by Young.