Watch a sneak peek and check out photos of the upcoming MERCY episode titled "Of Course I'm Not" Episode 18 airing Wednesday March 24 on NBC (8-9 p.m. ET).
Episode Synopsis: MARY STUART MASTERSON GUEST STARS - VERONICA IS AT ODDS WITH NOT ONLY HERSELF, BUT WITH DR. SANDS OVER A PATIENT'S TREATMENT; ELSEWHERE, SONIA'S UNIQUE PATIENTS MOTIVATE HER TO TAKE ACTION IN A ROMANTIC WAY - Veronica (Taylor Schilling) begins the difficult process of confronting her PTSD with her therapist (Mary Stuart Masterson). Although Sands (James Tupper) is eager to move forward with their relationship, Veronica finds herself siding with Briggs (James Van Der Beek) against him in a dispute over a patient's treatment. Chloe (Michelle Trachtenberg) and Harris (James LeGros) team up to help a cute college football player with a potential brain injury and Angel (Guillermo Diaz) butts heads with an eccentric ER patient. Meanwhile, Sonia (Jaime Lee Kirchner) cares for two hipsters after their hair-brained attempt to win a girl's heart lands them in the hospital, but their romantic gesture inspires her to make her own. Diego Klattenhoff also stars.