John and Nelle defend her father who was fired from his job as a teacher because he claims he's Santa Claus; Ally feels threatened when Larry's ex comes to town;Richard and Ling lip synch at the office Christmas party.

Ling's ex-fiancé is about to get married, but he's still in love with Ling. Larry's ex, Jamie, is back in town, and she's determined that it's going to work out for them this time.