"False Positive" — When Marshall and Lily receive shocking news, it has a profound effect on the gang and forces them to reexamine their own lives. Meanwhile, Robin gets a new job, Barney discovers the joy of giving on Christmas and Ted begins his duties as Best Man for his old friend Punchy's wedding, on HOW I MET YOUR MOTHER, Monday, Dec. 13 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Alex Trebek guest stars as himself and Tony Award winner Ben Vereen returns as Sam.
Source: CBS
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