Guest Stars Teryl Rothery as Dr. Janet Fraiser Vince Crestejo as Yu The Great Jacqueline Samuda as Nirrti Ron Halder as Cronus Michael David Simms as Secretary of Defense Arthur Simms Co Starring Laara Sadiq as Technician Laura Davis T.M. Sandulak as Sgt. Ziplinski Uncredited Michael Shanks voices Thor