Regular Cast: Nicholas Young as John, Sammie Winmill as Carol, Stephen Salmon as Kenny, Peter Vaughan-Clarke as Stephen, Philip Gilbert as TIM, Michael Standing as Ginge Harding.

Also Starring: Derek Crewe as Lefty, Francis de Wolff as Jedikiah, Patricia Denys as Cyclops, Robert Bridges as Policeman, Peter Weston as Mrs. Jameson, Neville Barber as Dr. Stewart, Christine Shaw as Staff Nurse.

5 Parts
Written by Brian Finch and Roger Price.
Directed by Paul Bernard.

 Original Transmission Dates:
Part One - 30th April 1973
Part Two - 7th May 1973
Part Three - 14th May 1973
Part Four - 21st May 1973
Part Five - 28th May 1973

Also Starring: Richard Speight as Peter, Roger Bizley as Jedikiah, Roger Booth as Rabowski, Dave Prowse as Coppin, Norman McGlen as Medusa.

4 Parts
Written by Brian Finch and Roger Price.
Directed by Roger Price.

 Original Transmission Dates:
Part One - 4th June 1973
Part Two - 11th June 1973
Part Three - 18th June 1973
Part Four - 25th June 1973

Also Starring: Derek Crewe as Lefty, Kenneth Farrington as Smithers, Kevin Stoney as Steen, Nova Llewellyn as Joy/Sandor, John Woodnutt as Spidron, David Weston as No. 300, Bara Chambers as Control Voice.

4 Parts
Written by Brian Finch and Roger Price.
Directed by Paul Bernard.

 Original Transmission Dates:
Part One - 9th July 1973
Part Two - 16th July 1973
Part Three - 23rd July 1973
Part Four - 30th July 1973