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Al is on vacation when a human named Harold moves into the house he'd been using to operate an interplanetary doorway. Al makes Harold chocolate chip cookies in an effort to soften the news that not only do aliens exist, but they're also frequent visitors to planet Earth. Oh, and the house's previous owner (a cat) gave Al permission to set up the doorway in the basement. Harold takes this in stride until the children start to arrive and the monkeys attack.