Much to Beverly's chagrin, Barry is thrilled that he gets to celebrate Christmas now that he is engaged to Lainey. Meanwhile, Murray's brother Marvin makes a promise to Adam with a surprising outcome.

Murray and Geoff team up to pull Beverly, Barry and Erica out of their shared misery that Lainey has left town. Adam's dread of gym class is amplified when Coach Mellor's brother, Coach Nick, arrives and uses fear as a motivator. Meanwhile, Coach Mellor prepares for the next step of his life.