Frank Cameron

Dr. Cox is all smiles when his ex-brother-in-law Ben returns, Christa Miller Lawrence, Tara Reid and Brendan Fraser Guest Star. -- Danni (guest star Tara Reid) and Jordan's (guest star Christa Miller Lawrence) brother, Ben (guest star Brendan Fraser) returns from traveling the world, a trip he's been on since his leukemia went into remission. When Dr. Cox learns he hasn't seen a doctor since he left, he recruits J.D. (Zach Braff) to do a thorough work up. Unfortunately, forcing J.D. to drop his other patients to run tests on Ben is a decision Dr. Cox soon regrets. Meanwhile, Elliot's (Sarah Chalke) concern about a bunion on her foot leads to the revelation that Carla (Judy Reyes) has been hiding something from Turk (Donald Faison). Ken Jenkins and Neil Flynn also star.

Featuring Special Guest Star Michael J. Fox; with the arrival of a visiting Super Doc to the hospital, J.D. reevaluates his mentor. -- Dr. Kevin Casey (guest star Michael J. Fox) comes to Sacred Heart as a visiting medical doctor and an accomplished surgeon despite being diagnosed with a severe case of obsessive compulsive disorder. Dr. Casey touches everyone at Sacred Heart in a special way during his visit, beating his old resident buddy Dr. Cox at his own game of wits, leaving Turk in the dust with his surgery time and teaching J.D. some very valuable lessons about learning to believe in himself. Meanwhile, Dr. Kelso strikes a deal with the Janitor to take care of the hospital's garbage, only to find himself eyeballs deep in it.

Dr. Cox searches for a pediatrician for his son and the young doctors get interns of their own; Scott Foley and Christopher Meloni Guest Star. -- As third year residents JD (Zach Braff), Turk (Donald Faison) and Elliot (Sarah Chalke) get their own set of interns and realize that they each have very different approaches training them. When JD needs help with training his interns he turns to Elliot and who refers him to her boyfriend, Sean (guest star Scott Foley) who shares some of the training tips he's picked up during his time at Seaworld. At the same time, Elliot experience with her interns makes her realize that she needs to stand up to Dr. Kelso (Ken Jenkins). Meanwhile, Dr. Cox (John C. McGinley) and Jordan (guest star Christa Miller Lawrence) are having some trouble finding a doctor for their kid, until they meet Dr. Norris (guest star Christopher Meloni) whose abrasive, yet somehow familiar personality makes his the perfect candidate for the job.

The doctors and surgeons at Sacred Heart are suddenly burdened by the obtrusive approach to management by Dr. Maddox.

The flight of a butterfly illustrates the delicate balance between the powers of medicine and nature. -- In a unique episode, the path of a butterfly is the deciding factor in the fate of the young doctors. At the beginning, a butterfly landing on a woman's breast sets off a chain of events ultimately resulting in the death of J.D. and Turk's patient, leaving them to wonder what they could have done to change the outcome of their day. Taking a step back in time, the butterfly takes a slightly different path, landing instead on a man's chest setting in motion an alternate chain of events that leads our characters down a very different path. Will this be enough to change the fate of their patients?