[5] John C. McGinley portrays Percival "Perry" Ulysses Cox, a senior attending physician at Sacred Heart, the hospital's residency director, and eventually chief of medicine in Season 8 ("My Cookie Pants").
At the end of the episode "My Coffee", she accepts an offer to go into private practice, allowing her to receive double the pay, still work at Sacred Heart, and never have to deal with superiors Dr. Cox (McGinley) or Dr. Kelso (Ken Jenkins) again.
Judy Reyes portrays Carla Espinosa, the hospital's head nurse, who acts as a mother figure to the interns, often hiding their mistakes from their attending doctor.
Lucy is at first overwhelmed by life in a hospital, especially when both her chief professor, Dr. Cox, and her student advisor, Denise Mahoney (Eliza Coupe), take an immediate dislike to her.
Seeking a respite, she sleeps with her classmate Cole Aaronson (Dave Franco), an arrogant rich kid who takes a naked picture of her without her knowledge and then humiliates her by letting it fall out of his backpack and into the wrong hands.
Ted leads an a cappella group with three other non-medical hospital employees called the "Worthless Peons" (played by The Blanks, the real-life band of Sam Lloyd), and is shown to be uncharacteristically confident when surrounded by his bandmates.
With the help of the Janitor and J.D., he finds the courage to ask Stephanie Gooch (Kate Micucci), a ukulele-playing musician who performs for the hospital's child patients, on a date, and the two form a relationship and move in together.
Jordan Sullivan, played by Christa Miller (the real-life spouse of series creator Bill Lawrence[18]), is the ex-wife of Perry Cox and a member (later retired) of the Sacred Heart Board of Directors.
She primarily targets men in their twenties for her one night stands, partly as a self-test to find out whether she is still sexually attractive to a younger age group, and she has admitted freely that she has undergone cosmetic surgery.
He became an expert coroner but still made several mistakes, such as forgetting a gurney, misplacing a dead body, or failing to retrieve a patient before rigor mortis set in.
Doug revealed that, after putting toe tags on cadavers for so long, he had developed a foot fetish, and he was later found hiding under a reception desk because he "got tired of looking at dead ones' feet".
Benjamin "Ben" Sullivan, played by Brendan Fraser, was a carpenter and photographer who was Jordan's and Danni's older brother and Cox's brother-in-law and best friend.
He was an expert at identifying actresses who had appeared naked in movies (a trait that allowed him to become fast friends with J.D., who had a similar skill), and was described by Jordan as "clumsy", which caused many accidents during his carpentry jobs.
Dr. Casey suffered from severe obsessive–compulsive disorder: He washed his hands hours after his last surgery, avoided lengthy physical contact, and drove home to use his own restroom.
Stating that medicine is all about obsession, he read and studied medical texts repeatedly and hypothesized every possible scenario that could befall a patient; he was undeniably competent and had high-self esteem.
Leonard, played by producer Randall Winston, was the hospital's security guard, easily recognizable thanks to his height, giant afro and the hook he had in place of his right hand.
One of the show's many running jokes (first made in Season 3's "My Screw Up") was that whenever he was mentioned, he was called the "big black security guard with the hook for the hand", but everyone knew him by his giant afro.
Clock was the second hottest employee at Sacred Heart (after Nurse Tisdale) and that he would kill to have sex with her; however, he also disapproved of her profession and sometimes referred to her as a "devil woman".
Clock was perky and extremely optimistic, expressing great joy over the fact that the hospital cafeteria was serving kielbasa and arguing that all people were innately good-natured.
It was later revealed that these fantasies related to Randall's being treated at Sacred Heart for a kidney injury after sparring in his karate class and to his frequent use of the expression "punch in the crotch" ("My Rule of Thumb”, Season 3).
learned in "My Butterfly" that Randall had been hired to work at Sacred Heart, he realized "why he's been back in my dreams"—that is, emerging from the chest cavity of a surgery patient and punching Turk in the crotch.
embarrassed them by showing that, even on second try, they were unable to solve the riddle of what two coins could be used to make 30 cents if one of them is not a nickel (a challenge he first presented to them in "My Lucky Night" in Season 3), the Janitor had to interfere so that Troy would not attack J.D.
In "My Moment of Un-Truth" (Season 3), the Janitor used Troy as the sole guest at a fake twin birthday party in the cafeteria, a video of which was supposed to serve as "indisputable evidence" to Turk and J.D.
While Jordan was ready to "give them another chance" a year later, Cox angrily turned down an invite to a camping trip with Zeltzer, his wife and "a pretty interesting guy named Ron" ("My Chopped Liver”, Season 5).
In "My Soul on Fire, Part 2”, at Lady's and Janitor's wedding ceremony, the Brain Trust's justice of the peace (a cameo by Bill Lawrence) reveals her full name.
In a guest appearance in "Something Good is Coming”, a Season 2 episode of Cougar Town, another series by Scrubs creator Bill Lawrence, Ted said that Gooch had run away with Hooch.
Harvey Corman, played by Richard Kind, was an "admittedly frugal hypochondriac" who appeared in the episodes "My Female Trouble”, "My Malpractical Decision”, "My Fault”, and "My New Old Friend".
Though he was exceptionally intelligent and skilled compared with the other interns, he remained content with being an average doctor and spent more time doing ridiculous activities with his friends than learning medicine.
He was known at Sacred Heart as "the Overly Touchy Orderly" because he appeared to have an extreme tactile addiction—touching everyone and offering rubs, massages, or just general physical contact, regardless of whether people consented.
His blunt manner often lands him in the hospital, with injuries caused by his mother (who pushed him down the stairs for saying she was fat and boring), his father, a woman he told she "smells like wet ass" and in one episode he has a broken penis.