Grier, who plays an ER doctor, is joined by Allison Tolman as a supervising nurse in the department; Mekki Leeper as a newly hired nurse; Josh Lawson as a self-important surgeon; Kaliko Kauahi as the front desk attendant; and McLendon-Covey as the executive director. They all want the hospital to succeed, but understaffing has taken its toll.

Check out this exclusive clip from NBC's upcoming comedy St. Denis Medical! In this hilarious sneak peek, we meet nurses Alex (Allison Tolman) and Serena (Kahyun Kim), who are anything but impressed as Dr.