By James Hibberd
March 21, 2011 at 12:00 PM EDT
Steven A Henry/; David Gabber/PR Photos

NBC and producers of The Office are pulling out all the stops for the finale of this pivotal seventh season, lining up several major guest stars for the final episode.

EW can exclusively reveal that Ricky Gervais and Will Arnett will appear in the finale.

What will they be doing? Can’t say. The episode is still being written. We can tell you the one-hour episode will air May 19, have Gervais appearing on the show for the second time, and has Arnett appearing for the first time. Also, that there will be other notable guest stars as well. 

Sources did warn that one shouldn’t assume that just because Gervais and Arnett are  in the finale, that either is going to replace Carell next season as the Office boss (but one can dream of it, right?).

The Office is also returning after a few weeks of hiatus this Thursday with a major Michael Scott-centered episode titled “Garage Sale.” The set-up is that Dunder Mifflin will have a garage sale in the warehouse, but there’s more to it than that…. (promo below)

Read more:

The Office director on Steve Carell’s ‘very emotional’ final episode

The Office to bid goodbye to Steve Carell on April 28

Will Ferrell hired as NBC’s Office temp

The Office earns early renewal for next season

No way Will Ferrell will be new Office boss, says Rainn Wilson