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A radio report alerts the Castaways that the boyfriend of Mary Ann (Dawn Wells) is marrying someone else. Reluctant to break the news to the girl, the Castaways speak with cryptic words and hushed whispers--leading Mary Ann to misunderstand their furtive comments, and to jump to the conclusion that she has eaten some poisoned mushrooms! This episode is highlighted by yet another dream sequence, in which Rusell Johnson (The Professor) amazes one and all with his spot-on Cary Grant imitation.