Guest Stars William deVry as Joshua Doors Kari Matchett as Lt. Siobhan Beckett Janet-Laine Green as Dr. Melissa Park Brooke Johnson as Quo'on Co Starring Ona Fletcher as Catherine Shaw Sonia Dhillon Tully as Rayna Armitraj Daniel Magder as 4 Year Old Liam Angelica Lisk-Hann as Cop James Binkley as Lab Technician Mark Huisman as Karilian Replicant Tony Meyler as Master Sergeant Bryan Renfro as Uniformed Tech Don Wilson as M.P. Steve Richard as Guard