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Bride and Prejudice (1x12)

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Gillian finds herself in mortal danger from a jealous genie who turns out to be Genie's fiancé, whom he inadvertently left at the altar 2,000 years ago when he was trapped in the rug. It turns out that all genie marriages are arranged, and Mickey's first date teaches Grandpa a lesson in the nature of love, causing him to reconsider the match.