 The premiere episode of the fourth season was titled "Chuck Versus the Anniversary", and aired on September 20.Season four guest starred Linda Hamilton, Dolph Lundgren, Harry Dean Stanton, Olivia Munn, Steve Austin, Dave Batista, Summer Glau, Timothy Dalton and Eric Roberts.It was announced on October 19, 2010 that NBC had ordered an additional 11 episodes of "Chuck", bringing the episode total for Season 4 to 24.