Peter MacNicol by Joseph Viles/Fox
Peter MacNicol's days on 24 are apparently over.

The actor has sealed a deal to return to CBS' Numbers next season as a full-time series regular, exec producer Cheryl Heuton confirms to me exclusively.

"Peter MacNicol's a vital part of the show, and we're thrilled to have him back," says Heuton. "The fans love him, we love him, and it's not the same show without him."

MacNicol left the CBS drama and his role as Dr. Larry Fleinhardt early in the season to join 24 as smarmy White House aide Tom Lennox. He briefly returned in May for one episode.

So, does Numbers + MacNicol = good news by your calculation? Do the math in the comments section below!