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Laurie Metcalf
Alyson Hannigan to Guest Star on 'The McCarthys'

LOS ANGELES ( - Alyson Hannigan is returning to CBS ... as a guest. The "How I Met Your Mother" actress will be guest starring on CBS' newest sitcom "The McCarthys." Hannigan, who portrayed Lily Aldrin on the long-running CBS show, will play Pam -- Marjorie (Laurie Metcalf) and Arthur's (Jack McGee) broken-hearted tenant. She's invited to join the family for Christmas Eve festivities, which end up being more than she bargained for when the Boston clan gets boisterous and competitive during their annual gift exchange. Hannigan is also well known for her role as Willow Rosenberg on "Buffy the Vampire Slayer" and Michelle Flaherty in...