Special Guest Stars Jeffrey Dean Morgan as Denny Duquette Guest Stars Kevin McKidd as Dr. Owen Hunt Melissa George as Sadie Harris Joshua Malina as Seth Hammer Leslie Grossman as Lauren Hammer Madeline Carroll as Ivy Soltanoff John Allen Nelson as Arthur Soltanoff Co Starring Mark Saul as Dr. Steve Mostow Nicole Rubio as Paramedic Nicole Cummins Molly Kidder as Dr. Megan Nowland Gloria Garayua as Dr. Graciella Guzman Joseph Williamson as Dr. Pierce Halley Winston Story as Dr. Leo Byrider Brandon Scott as Intern Ryan Jody Sclavos as ER Nurse