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An ice age is brought on by the effects of global warming and paleoclimatologist Jack Hall struggles through the masses fleeing south for warmer climate on his way north to reunite with his son.
Gloria learns about a secret that Claire has been hiding; one of Jay's proudest golf moments is ruined by Mitchell; Phil makes an inadvertent—and uncomfortable—discovery about one of his daughters.
The team searches for a serial killer who stages his murders to look like car accidents. William Mapother and Wil Wheaton guest star.
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