04/26/2012 11:43 am ET

Jennifer Morrison Joins 'House' Series Finale

Another Princeton-Plainsboro vet is on her way back to "House."

According to TVLine, Jennifer Morrison -- who played Allison Cameron on the show for five years -- will appear in the series' finale episode, airing on Monday, May 21 at 9 p.m. ET on Fox.

Morrison's character was last seen in Season 6, when she returned to finalize her divorce with Dr. Chase (Jesse Spencer), who she split up with after he intentionally killed a patient who was a third world dictator.

Morrison, who now stars on ABC's hit "Once Upon A Time," isn't the only "House" alum headed back to the series for a last hurrah. Amber Tamblyn will return as Martha Masters, while Olivia Wilde will make a final appearance as Thirteen despite her character being fired by House (Hugh Laurie) in October.

But the most intriguing reported return of all would be that of Kal Penn, whose character Kutner committed suicide in the show's fifth season. Rumors of Kutner's return in a flashback or dream sequence have been circling, but details are being kept under wraps.

Catch the series finale of "House" on Monday, May 21 at 9 p.m. ET on Fox.