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Though "Opie's Rival" was the first episode filmed for The Andy Griffith Show's third season, it was held back from public view until December 3, 1962, by which time the character of country nurse Peggy McMillan (Joanna Moore)-introduced in this episode-was firmly established (and in fact, had already left the series!) Believing that Peggy is stealing away Andy's affections, a jealous Opie is beside himself when his Paw invites Peggy to go fishing with them. Thus, Opie feigns several illnesses to keep Peggy and Andy apart. "Opie's Rival" was written by Sid Morse.