1972. Framed! Stars Ray Armstrong, Michael Barrington, Leonard Gregory & Caroline Ellis. Jill takes a tumble and Colin demonstrates the microscopic effects of Scorpio.
1972. The Race. Stars Ray Armstrong, Michael Barrington, Leonard Gregory & Caroline Ellis. Colin has been double-crossed while Mike and Steve take a trip to the races.
1972. Traitor. Stars Ray Armstrong, Michael Barrington, Leonard Gregory & Caroline Ellis. A scientist defects to the West with his invention, Scorpio. His rescuers want to exploit the device.
Red Herring. Ronald Leigh-Hunt, Wendy Padbury & Adrian Wright. Buchan has car problems, Sue and Mike take to bicycles. Caine has a plan to throw them off the scent.
Black Box. Ronald Leigh-Hunt, Wendy Padbury & Adrian Wright. Ryan and Burke have escaped with Nero's black box. But Buchan is more concerned with the missing gold.
Doomsday. Ronald Leigh-Hunt, Wendy Padbury & Adrian Wright. Nero is becoming increasingly insane, Buchan and his team must prevent him from destroying the world.