Episode: 401 | Aired: August 31, 2004
Turk and Carla return from their honeymoon and J.D. has to contend with a new doctor (guest star Heather Graham) and an enraged Elliot.
Episode: 402 | Aired: September 07, 2004
J.D. and Elliot vie for the chief resident position, but Dr. Cox throws them a curveball. Heather Graham guest stars.
Episode: 403 | Aired: September 14, 2004
Dr. Cox is shocked to hear that due to a clerical error, he is still married to Jordan. J.D. butts heads with Elliot.
Episode: 404 | Aired: September 21, 2004
Carla searches high and low for Turk and J.D.'s lost stuffed dog; J.D. worries about killing a patient. Heather Graham guest stars.
Episode: 405 | Aired: September 28, 2004
Elliot has doubts about taking on Molly (guest star Heather Graham) as a mentor after learning about her hillbilly home life.
Episode: 406 | Aired: October 12, 2004
J.D.'s brother (Tom Cavanagh) comes to town with bad news and Turk gets some surprising news of his own.
Episode: 407 | Aired: October 19, 2004
While J.D. struggles to handle his brother's interest in Elliot, Turk figures out that he can use his diabetes as an excuse for just about anything; Heather Graham and Tom Cavanagh guest star.
Episode: 408 | Aired: October 26, 2004
Elliot gives J.D. permission to sleep with Molly at her going-away party, while Dr. Cox is forced to spend time assisting an annoying paramedic. Heather Graham and Molly Shannon guest star.
Episode: 409 | Aired: November 09, 2004
J.D. and Dr. Cox treat the patient of a feared malpractice attorney, while Turk struggles to keep his distance from a hypochondriac patient. Julianna Margulies guest stars.
Episode: 410 | Aired: November 16, 2004
J.D. has a hard time breaking up with his controlling new girlfriend, but it's put a strain on his friendship with Turk. Julianna Margulies guest stars.
Episode: 411 | Aired: November 23, 2004
Carla and Jordan teach Elliot how to flaunt her femininity. J.D. searches for a patients relative, but winds up getting a big surprise; Matthew Perry guest stars.
Episode: 412 | Aired: December 07, 2004
Elliot tries to get over her paralyzing fear of children. The hospital staffers remember their finest moments as doctors.
Episode: 413 | Aired: January 18, 2005
J.D. struggles when Elliot proves to be better at handling coding patients. The Janitor and Ted launch into an informal battle-of-the-bands; Turk comes to a realization about his medical condition.
Episode: 414 | Aired: January 25, 2005
Colin Farrell guest stars as a chronic bar fighter who teaches Turk and J.D. a lesson about life and jumping to conclusions.
Episode: 415 | Aired: February 01, 2005
A raging case of gonorrhea gets between J.D. and a sexy bartender. Elliot stands up to Dr. Kelso.
Episode: 416 | Aired: February 08, 2005
J.D.'s attempts to impress his new girlfriend go horribly wrong when they get stuck at the hospital. While under quarantine, Turk learns about a dark secret from Carla's past.
Episode: 417 | Aired: February 15, 2005
After learning that his patient was a writer for Cheers, J.D. begins imagining his life as a traditional sitcom.
Episode: 418 | Aired: February 22, 2005
Dr. Cox suspects that the son of an old buddy is autistic. Carla and Turk ask J.D. to move out of the apartment but soon regret their decision.
Episode: 419 | Aired: March 01, 2005
J.D.'s new relationship is thrown for a loop when Molly (Heather Graham) returns to the hospital. Carla puts her foot down after Turk starts making frequent calls to an ex-girlfriend.
Episode: 420 | Aired: March 29, 2005
Dr. Kelso wears scrubs for the first time to prove a point, and Turk is intimidated by the challenge of repairing his relationship with Carla.
Episode: 421 | Aired: April 05, 2005
Elliot has trouble with a patient who has taken male enhancement pills. J.D. and Carla cross the line when he tries to help Turk and Carla back together.
Episode: 422 | Aired: April 12, 2005
The Janitor feels emasculated after he is issued a bright blue uniform; Turk finds out something surprising, and doesn't respond well to the news.
Episode: 423 | Aired: April 19, 2005
When an old lady is brought in by her much younger neighbor, J.D. gets a lesson in doing the right thing and Elliot has a new crush. Turk has problems opening up at couples therapy and the hospital becomes infested with rats.
Episode: 424 | Aired: April 26, 2005
Dr. Kelso and the Janitor fight for the use of a motorized cart; Dr. Cox gives Turk a lesson in egos.
Episode: 425 | Aired: May 10, 2005
J.D. moves out after Carla and Turk decide to make an addition to their family. Elliot interviews at a different hospital.