At this point I'm starting to wonder if FOX even filmed a 'House' series finale, or if in fact the May 21 swan song "Everybody Dies" will simply consist of previous 'House' footage stitched together, with Hugh Laurie digitally added for witty one-liners and acerbic retort.  It worked for 'Airwolf,' so why not here?  But whatever you believe, it seems that the good doctor's final outing has picked up yet another previously departed 'House' alumni.

Joining Olivia Wilde's Dr. Remy "Thirteen" Chase, Amber Tamblyn's Dr. Martha Masters, and even somehow Kal Penn's deceased Dr. Lawrence Kutner, TVLine reports that former 'House' star Jennifer Morrison will also reprise her role as Dr. Allison Cameron for the May 21 series finale "Everybody Dies."  Morrison's character hasn't been seen since season 6 episode "Lockdown," and Morrison herself currently stars on ABC's breakout hit 'Once Upon A Time.'

It remains unclear exactly what the nature of Morrison's appearance will be, given that we know Olivia Wilde will appear in more than one episode, and Kal Penn's appearance as his deceased character suggests that Dr. House might see some of his old pals in a fantasy sequence.  It had previously been assumed by upcoming episode "The C Word" that House might develop cancer, or even die off in the finale, though while not disproving anything, the previous episode revealed  - SPOILER ALERT - House's best friend Dr. Wilson (Robert Sean Leonard) to be the one afflicted.

But who needs speculation, when we have detailed descriptions of the next few episodes, courtesy of FOX?:

April 30: “The C-Word”

In an episode directed by Hugh Laurie, the team takes on the case of a six-year-old (guest star Rachel Eggleston) with numerous pre-existing health problems. They soon realize they must work with the girl’s mother, Elizabeth (guest star Jessica Collins), a doctor who specializes in her daughter’s genetic condition. But while searching the family’s home for clues, the team discovers that Elizabeth’s determination to cure her daughter could be the very thing that is killing her. Also, House and Wilson take a little vacation.

May 7: “Post Mortem”

In an episode directed by and guest-starring Peter Weller (Dexter, RoboCop), the team takes on the case of Dr. Peter Treiber (guest star Jamie Elman), a pathologist at Princeton-Plainsboro Teaching Hospital who knows too much about the hospital staff to trust any of the physicians. The only person he does respect is House, who has mysteriously gone missing. With House in absentia, the team has to figure out how to treat Treiber while making him believe that House is calling all the shots.

May 14: “Holding On”

Former Princeton Plainsboro colleague Thirteen (Olivia Wilde) returns in an all-new episode. The team takes on the case of Derrick (guest star Skylar Astin), a 19-year-old college student who had a mysterious nose bleed during cheerleading practice, and discovers that his health issues are likely both physiological and psychological. Possibly suffering from schizophrenia, Derrick claims to hear his deceased brother’s voice in his head. Meanwhile, Foreman tries a different approach with House.

May 21: “Everybody Dies” (Series Finale)

In the emotional series finale, which is preceded by an hour-long retrospective, treating a drug addict patient (guest star James Legros) results in House examining his life, his future and his own personal demons.

Just who do you think might be the next, if any 'House' alumni to pop up in the series finale?  Will you be tuning in for the May 21 swan song?  Give us your theories and best 'House' memories in the comments below!