It's hard to believe that the series finale of Chuck aired over four years ago! No one could make us laugh quite like Zachary Levi in that show.
Over the course of the show's five seasons, plenty of celebrities guest starred in an episode. Scroll down to see 12 celebs you totally forgot were a part of the series.
Olivia Munn (Greta)
Stacy Keibler (Captain Victoria Dunwoody)
Nicole Richie (Heather Chandler)
Rachel Bilson (Lou)
Danny Pudi (Vali Chandrasekaren)
Gary Cole (Jack Burton)
Jenny McCarthy (Sylvia Arculin) and Andy Richter (Brad White)
Matt Bomer (Bryce Larkin)
Ben Savage (Mark Ratner)
Michael Strahan (Mitt)
Steve Austin (Hugo Panzer)