Official NBC Synopsis:
"Scrubs" focuses on the strange experiences of Dr. John Dorian, or "J.D." (Zach Braff, "Last Kiss," "Garden State"), a medical resident, as he continues on his healing career in a surreal hospital, crammed full of unpredictable staffers and patients -- where humor and tragedy can collide at any time.

Joining the rumpled J.D. at Sacred Heart Hospital are fellow residents Chris Turk (Donald Faison, "Remember the Titans," "Felicity") -- J.D.'s college buddy who is part of the elite surgical group -- and the beautiful, but socially awkward, Elliot Reid (Sarah Chalke, "Roseanne").

Keeping a watchful eye over these young doctors are the caustic chief of medicine, Dr. Bob Kelso (Ken Jenkins, "Courage Under Fire"), the abrasive, but caring Dr. Perry Cox (John C. McGinley, "Wall Street," "Platoon"), and Turk’s wife and no-nonsense nurse, Carla Espinosa (Judy Reyes, "Oz"). Neil Flynn ("Magnolia"), the hospital janitor, portrays J.D.'s nemesis, who never seems to miss an opportunity to harass his target.

Season 7
My Own Worst Enemy (October 25, 2007)
My Hard Labor (November 1, 2007)
My Inconvenient Truth (November 8, 2007)
My Identity Crisis (November 15, 2007)
My Growing Pains (November 29, 2007)
My Number One Doctor (December 6, 2007)
My Bad Too (April 10, 2008)
My Manhood (April 17, 2008)
My Dumb Luck (April 24, 2008)

The Musical Episode:
The episode begins when a patient is admitted into the hospital due to a fainting spell. What she experiences from that point forward is singing and dancing. The musical includes songs composed by Avenue Q’s Robert Lopez and Jeff Marx. Some of the notable numbers in the episode are “Welcome to Sacred Heart,” “Everything Comes Down to Poo,” “We’re Gonna Miss You, Carla,” “You Annoy Me,” “When the Truth Comes Out,” and “What’s Going to Happen”.

Zach Braff (John "J.D." Dorion)
Sarah Chalke (Elliot Reid)
Donald Faison (Dr. Christopher Turk)
Judy Reyes (Carla Espinosa )
John C. McGinley (Dr. Percival "Perry" Cox)
Ken Jenkins (Dr. Bob Kelso)
Neil Flynn ("The Janitor")

Guest Stars:

-Ryan Reynolds:My Dream Job (Season 2)
Reynolds plays J.D. and Turk’s college buddy, Spence, a financial advisor living the high life.

-Amy Smart: My T.C.W, My Interpretation, My Drama Queen (Season 2)
Smart appears in three episodes of Scrubs. She plays Jamie Moyer, also known as T.C.W. (Tasty Coma Wife). Jamie’s husband is a coma patient and she visits her husband every Wednesday at the hospital. J.D.is attracted to her.

-Jay Mohr: My Own Private Practice Guy (Season 2)
Mohr plays Dr. Peter Fisher, a private practice doctor that tends to one of J.D.’s patients and is also a close friend of Dr. Cox.

-Rick Schroder: His Story (Season 2)
Schroder plays Paul, a nurse at the hospital that strikes up conversation with Elliot. Elliot is attracted to Paul, but is not quite comfortable dating a male nurse.

-D.L. Hughley: My Brother, My Keeper (Season 2)
Hughley appears in two episodes in season 2 as Turk’s older brother, Kevin.

-Dick Van Dyke: My Brother, My Keeper (Season 2)
Dick Van Dyke plays Dr. Townshead, a well-respected doctor that J.D. is assigned to work with. He is also Dr. Kelso’s best friend.

-Alan Ruck: My Lucky Day (Season 2)
Ruck plays Mr. Bragin, a patient suing Elliot for malpractice. She inaccurately diagnosed Mr. Bragin with pancreatic cancer and told him he only had eight months to live.

-Heather Locklear: My First Step, My Fruit Cup (Season 2)
Locklear stars as Julie Keaton, the hot pharmaceutical rep at the hospital who is doing her sales rounds.

-Christa Miller: My Own Personal Jesus, My Tuscaloosa Heart, My Occurrence, My Hero, My Last Day, My Overkill, My Nightingale, My Fruit Cups, My Lucky Day, My Brother My Keeper (Seasons 1 and 2)
Miller appears in ten episodes as Dr. Cox’s ex-wife, Jordan Sullivan.

-Tom Cavanagh: My Big Brother (Season 2)
Cavanagh plays J.D.’s older brother, Dan Dorian who has come to visit his brother.

-Brendan Frasier: My Occurrence, My Hero (Season 1)
Frasier plays Dr. Cox’s former brother-in-law, Ben Sullivan, who is diagnosed with Leukemia.

-Scott Foley: My Way Or The Highway, My Sacrificial Clam (Season 1)
Foley is patient, Sean Kelly that Elliot is immediately attracted to.

-John Ritter: My Old Man (Season 1)
Ritter plays Sam Dorian, J.D.’s father

-Kelli Williams: My Tuscaloosa Heart (Season 1)
Williams plays medical student, Kristin, who starts a relationship with Dr. Cox

-Sean Hayes: My Super Ego (Season 1)
Hayes plays rival intern, Nick Murdoch who is smart and confident. He eventually drops out of the residency program because of the extreme pressure.