Guest Stars Christine Lakin as Rachel Wells Susan Misner as Leah Mayne Virginia Watson as Nurse Ruth Corruthers Joe Guzaldo as Pete Iger Randy Vasquez as NCIS Agent Roger Voight Michael Edward Rose as Marine Major Gordon Holcomb Alex Hyde-White as Dr. Adam Tallridge John Edward Lee as Former Marine Sergeant Matthew Gontz Lauren Sánchez as NCIS Agent Sanchez Robert Maxhimer as National Park Officer Will Elliott Ryan McCann as Former 1st Lieutenant John Mayne Wolfgang Bodison as National Park Inspector Edward Killian Sarah Lewis as I.C.U. Doctor