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Mork thinks Russian immigrant Sergei Krushnev is an alien like him, and tries to help welcome him. Trouble ensues when Sergei tells Mork that 'aliens' need to be registered.
Mork learns about the meaning of Christmas, and helps remind everyone else about it when he invites the obnoxious Susan Taylor to spend Christmas with the McConnell's because she's got no one to celebrate with.
Mindy is irritated by her grouchy new neighbor, Mr. Bickley, but Mork is determined to be friends with him.