- “You are in very capable, 9-fingered hands.”— Dr. Cox
Rex is a resident at Sacred Heart Hospital.
Rex is a resident at Sacred Heart and lost his finger when trying to give a patient with dementia medicine by taking the medicine and putting it in raspberry jam and stuffing it into her mouth as J.D. recommended since the patient had a sweets craving. J.D. once wanted to cut his tie off but accidentally opened his chest with a circular saw. For that, Rex was the first intern to get ketchup on his burger. ("My Rite of Passage")
Dr. Cox reacts against the other residents' praise of the show House, saying that "...doctors damn sure don't look like models, they look like Rex." In the same episode, Dr. Cox also shaves off one of Rex's sideburns because he had a custom license plate that said "Party Doc." ("My House")
- Rex appeared in J.D.'s last fantasy at Sacred Heart. ("My Finale")
- Because Rex's portrayer, Aaron Ikeda, is from Hawaii, people often give him unique insults such as "Portly Island Boy," or claiming he worships "Moco, the Samoan Bird King."
- Portly Island Boy
- Party Doc