| Season One | 30 color episodes in 60 minute format | |||
|---|---|---|---|---|
| Ep | PN | Airdate | Title | |
| 1 | 101 | Sep 25/68(UK) | The Beginning | |
| 2 | 107 | Oct 02/68(UK) | The Invisible Man | |
| 3 | 123 | Oct 09/68(UK) | Reply Box No. 666 | |
| 4 | 111 | Oct 16/68(UK) | The Experiment | |
| 5 | 129 | Oct 23/68(UK) | Happening | |
| 6 | 104 | Oct 30/68(UK) | Operation Deep-Freeze | |
| 7 | 126 | Nov 06/68(UK) | The Survivors | |
| 8 | 108 | Nov 13/68(UK) | To Trap a Rat | |
| 9 | 110 | Nov 20/68(UK) | The Iron Man | |
| 10 | 122 | Nov 27/68(UK) | The Ghost Plane | |
| 11 | 103 | Dec 04/68(UK) | The Dark Island | |
| 12 | 113 | Dec 11/68(UK) | The Fanatics | |
| 13 | 114 | Dec 18/68(UK) | Twelve Hours | |
| 14 | 106 | Jan 01/69(UK) | The Search | |
| 15 | 119 | Jan 08/69(UK) | The Gilded Cage | |
| 16 | 124 | Jan 15/69(UK) | Shadow of the Panther | |
| 17 | 117 | Jan 22/69(UK) | A Case of Lemmings | |
| 18 | 109 | Jan 29/69(UK) | The Mission | |
| 19 | 115 | Feb 05/69(UK) | The Interrogation | |
| 20 | 105 | Feb 12/69(UK) | The Silent Enemy | |
| 21 | 121 | Feb 19/69(UK) | The Body Snatchers | |
| 22 | 116 | Feb 26/69(UK) | Get Me Out of Here! | |
| 23 | 112 | Mar 05/69(UK) | The Night People | |
| 24 | 118 | Mar 12/69(UK) | Project Zero | |
| 25 | 130 | Mar 19/69(UK) | Desert Journey | |
| 26 | 120 | Mar 26/69(UK) | Full Circle | |
| 27 | 125 | Apr 02/69(UK) | Nutcracker | |
| 28 | 128 | Apr 16/69(UK) | The Final Countdown | |
| 29 | 102 | Apr 23/69(UK) | The Gun-Runners | |
| 30 | 127 | Apr 30/69(UK) | Autokill | |
