- Ep: 1
- The Most Special Agent
- Teleplay By: Gerry & Sylvia Anderson
- Directed By: Desmond Saunders
- Ep: 2
- Hi-Jacked
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 3
- Splashdown
- Teleplay By: Shane Rimmer (Incorrectly credited to Tony Barwick)
- Directed By: Leo Eaton
- Ep: 4
- Operation McClaine
- Teleplay By: Gerry Anderson & David Lane
- Directed By: Ken Turner
- Ep: 5
- Three's a Crowd
- Teleplay By: Tony Barwick
- Directed By: Peter Anderson
- Ep: 6
- International Concerto
- Uncredited: Shane Rimmer (Kelly / Clerk / Technician)
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 7
- Big Fish
- Uncredited: Shane Rimmer (Gardner)
- Teleplay By: Shane Rimmer
- Directed By: Leo Eaton
- Ep: 8
- The Unorthodox Shepherd
- Teleplay By: Tony Barwick
- Directed By: Ken Turner
- Ep: 9
- Relative Danger
- Uncredited: Shane Rimmer (Voice of Johnson)
- Teleplay By: Shane Rimmer
- Directed By: Peter Anderson
- Ep: 10
- Business Holiday
- Uncredited: Shane Rimmer (Colonel Henderson / Taxi Driver)
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 11
- King For a Day
- Teleplay By: Shane Rimmer
- Directed By: Leo Eaton
- Ep: 12
- Double Agent
- Uncredited: Shane Rimmer (Voice of Radio Control)
- Teleplay By: Tony Barwick
- Directed By: Ken Turner
- Ep: 13
- Most Special Astronaut
- Uncredited: Shane Rimmer (Kent)
- Teleplay By: Tony Barwick
- Directed By: Peter Anderson
- Ep: 14
- Arctic Adventure
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 15
- The Fortress
- Teleplay By: Shane Rimmer
- Directed By: Leo Eaton
- Ep: 16
- Colonel McClaine
- Teleplay By: Tony Barwick
- Directed By: Ken Turner
- Ep: 17
- Project 90
- Teleplay By: Tony Barwick
- Directed By: Peter Anderson
- Ep: 18
- The Race
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 19
- The Professional
- Teleplay By: Donald James
- Directed By: Leo Eaton
- Ep: 20
- Lone-Handed 90
- Teleplay By: Desmond Saunders & Keith Wilson
- Directed By: Ken Turner
- Ep: 21
- Attack of the Tiger
- Teleplay By: Tony Barwick
- Directed By: Peter Anderson
- Ep: 22
- Talkdown
- Teleplay By: Tony Barwick
- Directed By: Alan Perry
- Ep: 23
- Breakout
- Teleplay By: Shane Rimmer
- Directed By: Leo Eaton
- Ep: 24
- Mission X-41
- Teleplay By: Pat Dunlop
- Directed By: Ken Turner
- Ep: 25
- Test Flight
- Teleplay By: Donald James
- Directed By: Peter Anderson
- Ep: 26
- Child of the Sun God
- Teleplay By: John Lucarotti
- Directed By: Alan Perry
- Ep: 27
- Trial at Sea
- Teleplay By: Donald James
- Directed By: Brian Heard
- Ep: 28
- See You Down There
- Teleplay By: Tony Barwick
- Directed By: Leo Eaton
- Ep: 29
- The Birthday
- Teleplay By: Tony Barwick
- Directed By: Leo Eaton
- Ep: 30
- Viva Cordova
- Uncredited: Liz Morgan (Dorina Cordova)
- Teleplay By: Tony Barwick
- Directed By: Peter Anderson
| Keith Alexander ....................... Sam Loover |
| Sylvia Anderson ...................... Mrs. Harris |
| Rupert Davies ....... Professor Ian "Mac" McClaine |
| Gary Files ............................... various |
| Len Jones ........................... Joe McClaine |
| Martin King .............................. various |
| David Healy ......................... Shane Weston |
| Jeremy Wilkin ............................ various |
