Will Ferrell is only stopping by The Office for a quartet of episodes.

Rickey Gervais and Will Arnett are confirmed for the seventh season finale, but neither will stick around beyond that. So, who will take over for Steve Carell as Regional Manager of Dundler Mifflin Scranton? TV Line has throw out a few fresh possibilities.

An NBC source reports that Ray Romano, James Spader and Catherine Tate will all guest star on the hour-long May 19 episode.

The former is committed to TNT's Men of a Certain Age, but either Spader or Tate are serious contenders for the permanent gig. The latter is a British comedian who starred on Dr. Who for four seasons and also anchored her own sketch series prior to that.