ABCs Shifting Gears will celebrate the holidays with Better Things creator and star Pamela Adlon.

The Tim Allen-led comedy has cast Adlon in a guest role as Gabriels (Seann William Scott) opinionated single mother. The episode is scheduled to air Dec. 10.

The logline for the episode, titled Nutcracker, reads, This holiday season, the Parkers discover that romance isnt always a smooth ride as Matt (Allen) and Eve (Jenna Elfman) are on thin ice, Gabe enlists Riley (Kat Dennings) to help Amelie (Carson Fagerbakke) impress his mom (Adlon), and Carter (Maxwell Simkins) seeks help with his promposal. Shifting Gears has gotten off to a solid start on ABC in its second season. The Oct. 1 season premiere drew 7.57 million cross-platform viewers over its first seven days; the show is averaging a little under 4 million viewers for its initial airings on the network.

Shifting Gears is produced by 20th Television. Allen executive produces with Michelle Nader, Marty Adelstein, Becky Clements, Richard Baker, Rick Messina, John Pasquin, Jim Patterson, Bob Daily and John Amodeo. Dennings is a producer.

Adlon reprises her voice role as Bobby in Hulus King of the Hill revival, which last week was renewed for two more seasons. She won an Emmy for the role in 2002 and has two lead actress Emmy nominations for her work on FXs Better Things. Her recent live-action credits include episodes of Hulus Mid-Century Modern and History of the World Part II and CBS Elsbeth. She is repped by CAA, Vie Entertainment, ID and Felker Toczek.