November 23, 2010 at 08:20 PM EST

Image Credit: Nicole Rivelli/NBCHow will Liz Lemon and company be celebrating the holidays? With (SPOILER ALERT) some pretty major life events, particularly for expectant-dad Jack (Alec Baldwin), though the bundle of joy isn’t due until early 2011. “The Christmas episode is the big one for us,” executive producer Robert Carlock says. “It’s the long-awaited reunion of Jack’s biological parents. A couple of years ago, Jack discovered his real father, but just to avoid an argument, he hasn’t told his mother that he knows her shameful sex secret.” That means guest appearances from Elaine Stritch and Alan Alda as said parents, with the requisite on-screen fireworks.

Leading up to that family reunion, Will Forte will return as Jenna’s drag-queen-who-dresses-as-her boyfriend for a few episodes. “They have some ups and downs,” Carlock says. “He wants to try to be a normal couple, and she is afraid of that level of commitment.” New Year’s, meanwhile, will herald the return of another significant-other guest star, thanks to possible nuptials for Jack and baby-mama Avery (Elizabeth Banks): “The plan is for Jack and Avery to get married on New Year’s Eve on a French-speaking island,” Carlock teases, “but we discover when they get back that not everything went as planned.”

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