Tony is working on the plans for the Apollo space craft. However, Dr. Bellows informs him that because of a security leak he must be taken to a secure area until he is finished with his work. After Tony leaves, a double of his appears and is instructed by Dr. Bellows to go to Tony's house and act like him until he returns from his assignment. Unfortunately, like Dr. Bellows, the impostor knows nothing about Jeannie and soon he thinks he is losing his mind as Jeannie starts using her powers. Jeannie thinks that Tony is acting strangely and eventually the impostor proposes to her. The impostor then goes to Dr. Bellows and informs him of what's going on. Bellows decides that this is the perfect opportunity to finally find out what's really going on. In the meantime, Roger, who tries to keep the double from informing Doctor Bellows about Jeannie, accidentally finds out about the switch and now must find a way to not only to keep Jeannie's secret, but to keep the wedding from happeni
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