Jennifer Hall ("Missy" on NBC's "UP ALL NIGHT")

Jennifer Hall stars as Missy, Ava’s (Maya Rudolph) hapless assistant, on NBC's new comedy “Up All Night.”

NEW YEAR'S EVE CHRIS AND REAGAN’S NEW YEAR’S EVE GAME NIGHT DOES NOT GO ACCORDING TO PLAN – JASON LEE GUEST STARS -- Reagan's (Christina Applegate) extreme competiveness comes out at a New Year's Eve game night, much to Chris’s (Will Arnett) embarrassment. Meanwhile, Kevin (guest star Jason Lee) worries that Ava (Maya Rudolph) is ashamed of him and Missy (Jennifer Hall) brings an unexpected date to the party. Up All Night airs Thursday nights @ 9:30pm (eastern) on NBC.