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Cub reporter Jimmy Olsen (Jack Larson) is mistaken for Prince Gregory of Burgonia (Chet Marshall), who has been targeted for assassination. Putting his life on the line, Jimmy agrees to impersonate Gregory, the better to bring the would-be killer out in the open. Once the not-so-well-hidden culprit is revealed, things look mighty bleak for our boy Jimmy--but never fear, Superman (Clark Kent) is dashing to the rescue. This was the final episode of The Adventures of Superman's third season.