Guest Stars Jesse Williams as Dr. Jackson Avery Sarah Drew as Dr. April Kepner Kim Raver as Dr. Teddy Altman Robert Baker as Dr. Charles Percy Lance Barber as Phil Richard T. Jones as Captain Dan Sara Gilbert as Kim Allen Adam Kulbersh as Tommy Derek Cecil as Sean Allen Zachary Knower as Nick Kelsey Co Starring Nicole Rubio as Paramedic Nicole Cummins Maurice Irvin as Nurse Tyler Christian Phil Abrams as Dr. Jim Nelson Tristen MacDonald as Sgt. Rebecca Cohen Aaron Perilo as Peter "Gekko" Gekofsky Kinsey McLean as Billy Linneman Seth McLaughlin as Corporal Burnett