The Dunder Mifflin gang celebrates Christmas on tonight's new episode of The Office, and Amy Ryan returns for another guest appearance.  Below you'll find a synopsis and five sneak peeks from NBC.

MICHAEL IS THRILLED WHEN TOBY TAKES A LEAVE OF ABSENCE

AMY RYAN (“Gone Baby Gone”) GUEST STARS

Michael could not be happier when Toby (Paul Lieberstein) has to take a leave of absence and corporate sends Holly Flax (guest star Amy Ryan) to cover for him. Pam (Jenna Fischer) is forced to do a second Christmas party after Michael (Golden Globe winner Steve Carell) wants the party to be on the day Holly returns to Scranton.

Meanwhile, Jim (John Krasinski) regrets agreeing to a snowball fight with Dwight (Rainn Wilson). Ed Helms, Leslie David Baker, Brian Baumgartner, Kate Flannery, Mindy Kaling, Angela Kinsey, Phyllis Smith, Oscar Nunez, Creed Bratton, B.J. Novak, Ellie Kemper, Craig Robinson, Zach Woods and Paul Lieberstein also star.