Main Characters Dr. Kay 'Kayo' O'Brien 13 main appearances Dr. Mark Doyle 13 main appearances Doctor Robert Moffitt 13 main appearances Dr. Josef Wallach 13 main appearances Dr. Michael Kwan 13 main appearances Rosa Villanueva, RN 13 main appearances Dr. Cliff Margolis 13 main appearances
Recurring Guest Characters Detective Lou Ashman 3 guest appearances Nat 3 guest appearances unknown 3 guest appearances Angelo Agretti 1 guest appearances Donny 1 guest appearances Jack O' Brien 1 guest appearances Lucille O'Brien 1 guest appearances Tom Woo 1 guest appearances Sean McCandliss 1 guest appearances Bret Richardson 1 guest appearances Sarah Avery 1 guest appearances Lee Villanueva 1 guest appearances Dr. Clinton Forrestal 1 guest appearances Nathan Obermann 1 guest appearances Sam Deckerman 1 guest appearances Allison Villanueva 1 guest appearances Danny Villanueva 1 guest appearances Mae McCarthy 1 guest appearances Fredrick Holcolmb 1 guest appearances Dr. Raji Gupta 1 guest appearances ⇤ « 1 2 3 » ⇥