Guest Stars Tasso Feldman as Dr. Irving Feldman Denitra Isler as Nurse Ellen Hundley Michael Hogan as Dr. Albert Nolan Radek Wallace Lord as Grayson Betournay Julianna Guill as Jessie Nevin Bethany Geaber as Nurse Isabel Sharp Emil Beheshti as Dr. Arthur Franklin Julia Campbell as Vivian Betournay Ian Gregg as Jokester / Mason Buck Mike Forbs as Transpo Worker Harold Mabbot Bailey Noble as Laurie Dante Adam Boyer as Frank Tanner Deep Rai as Lab Tech Ricky Vaskell Sean Michael Weber as Tarzan Denise Santos as Mrs. Tannar Blane Crockarell as Young Conrad