Jonathan LaPaglia

as Lt. Frank Bartholomew Parker

Alan Scarfe

as Dr. Bradley Talmadge

Justina Vail

as Dr. Olga Vukavitch

Nick Searcy

as Agent Nathan Ramsey

Don Franklin

as Capt. Craig Donovan

Sam Whipple

as Dr. John Ballard

Norman Lloyd

as Dr. Isaac Mentnor

Kevin Christy

as Andrew "Hooter" Owsley