Photo Flash: First Look - Roseanne Guest Stars on THE OFFICE, 4/11

On THE OFFICE's upcoming episode, titled "Stairmageddon," Stairmaggedon" strikes The Office when the elevator goes out and everyone is forced to take the stairs. Dwight (Rainn Wilson) forces Stanley (Leslie David Baker) to do an important sales call. Pam (Jenna Fischer) and Jim (John Krasinski) find comfort in talking with Nellie (Catherine Tate) and Toby (Paul Lieberstein) about marital troubles. Meanwhile, Angela (Angela Kinsey) stands by her man. Ed Helms, Phyllis Smith, Brian Baumgartner, Oscar Nunez, Kate Flannery, Creed Bratton, Craig Robinson, Ellie Kemper, Clark Dukeand Jake Lacy also star.

Check out a first look below!

Photos by: Byron Cohen/NBC

Ed Helms

Craig Robinson, Ed Helms

Rainn Wilson

Brian Baumgartner, Oscar Nunez, Angela Kinsey

Roseanne Barr

Ed Helms, Roseanne Barr

Paul Feig

Ed Helms, Paul Feig