The actor reflects on a key moment from the hit medical drama, telling PEOPLE it led to "one of the more revelatory storylines" for his character Noah Wyle is looking back on his time portraying Dr.

Over its 15-season run, ERintroduced plenty of memorable characters, but few resonated quite like Dr. John Carter. Played by the formidable Noah Wyle, Carter evolved from a wide-eyed med student to ...