• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux)
• Co-Starring: Moray Watson (Commander), Keith Varnier (Controller), Gennie Nevinson (Lee Jones), Linda Newton (Pal Kenzy), Andrew Secombe (Brian Lincoln), Frederik de Groot (Hans Diter), Luke Hanson (Lars Hendvorrsen), Katja Kersten (Marie Mueller)
• Written By: Chris Boucher
• Directed By: Christopher Baker

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis)
• Co-Starring: Gennie Nevinson (Lee Jones), Sian Webber (Corman), Alan Downer (Paton), Sean Scanlan (Fox), Carmen Gomez (Gina), Benny Young (John Smith), Deborah Manship (Traffic Controller), Richard Ireson (Mike), Rosie Kerslake (Lara)
• Written By: Chris Boucher
• Directed By: Christopher Baker

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy)
• Co-Starring: David John Pope (Michael Chandri), Trevor Butler (Leo), Thomas Coulthard (Ben), Tara Ward (Shuttle Hostess), Peter Quince (Shift Foreman), Peter Glancy (Process Operator)
• Written By: Chris Boucher
• Directed By: Christopher Baker

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko)
• Co-Starring: Daniel Benzali (Commander Griffin), Marlena Mackey (Dilly Goodman), Robert Jezek (Pete Lennox), Russell Wootton (Marty), Angela Crow (Lauter), Morgan Deare (Harvey Goodman), Shope Shodeinde (Receptionist)
• Written By: Chris Boucher
• Directed By: Graeme Harper

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko)
• Co-Starring: Michael Chesden (Carlo Santanini), Susan Curnow (Marla Condarini), Stewart Guidotti (Inspector Canova), Vikki Chambers (Lina Margello), Flip Webster (Personnel Officer), Andre Winterton (Angelo Pordenone), Carl Forgione (Tour Guide)
• Written By: Philip Martin
• Directed By: Graeme Harper

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko), Sayo Inaba (Anna Shoun)
• Co-Starring: Richard Rees (Richard Ho), Dawn Keeler (Christina Janssen), Susan Tan (Receptionist)
• Written By: John Collee
• Directed By: Graeme Harper

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko), Sayo Inaba (Anna Shoun)
• Co-Starring: Brian Gwaspari (James Bannerman / Albi), Nitza Saul (Chamsya Assadi)
• Written By: John Collee
• Directed By: Christopher Baker

• Starring: David Calder (Nathan Spring)
• With: Erick Ray Evans (David Theroux), Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko), Sayo Inaba (Anna Shoun)
• Co-Starring: Geoffrey Bayldon (Ernest Wolffhart), Maggie Ollerenshaw (Dr. Angela Parr), Barrie Rutter (Hooper), Leigh Funnell (Beverly Anderson)
• Written By: John Collee
• Directed By: Christopher Baker

• Starring: David Calder (Nathan Spring)
• With: Trevor Cooper (Colin Devis), Linda Newton (Pal Kenzy), Jonathan Adams (Alexander Krivenko), Sayo Inaba (Anna Shoun)
• Co-Starring: Roy Holder (Daniel Larwood), Nigel Hughes (Andrew Philpot), Lachelle Carl (Susan Caxton), Wendy MacAdam (Operations Manager), Bridget Lynch-Blosse (Co-Pilot), Kenneth Lodge (Pilot), Peter Neathey (Customs Officer), Philip Rowlands (Outpost Controller), David Janes (Surveyor)
• Written By: Chris Boucher
• Directed By: Graeme Harper

• Written By: Philip Martin
• Would Have Been Directed By: Graeme Harper
• Note: Production had started on this episode when a strike at the BBC caused it to be dropped.