A secret, high-technology international agency called SHADO defends Earth from alien invaders.
| Title | Time | |
|---|---|---|
| 1 | Identified | 1970-09-16 |
| 2 | Exposed | 1970-09-23 |
| 3 | The Cat With Ten Lives | 1970-09-30 |
| 4 | Conflict | 1970-10-07 |
| 5 | A Question of Priorities | 1970-10-14 |
| 6 | E.S.P. | 1970-10-21 |
| 7 | Kill Straker! | 1970-11-04 |
| 8 | Sub-Smash | 1970-11-11 |
| 9 | Destruction | 1970-12-02 |
| 10 | The Square Triangle | 1970-12-09 |
| 11 | Close Up | 1970-12-16 |
| 12 | The Psychobombs | 1970-12-30 |
| 13 | Survival | 1971-01-06 |
| 14 | Mindbender | 1971-01-13 |
| 15 | Flight Path | 1971-01-20 |
| 16 | The Man Who Came Back | 1971-02-03 |
| 17 | The Dalotek Affair | 1971-02-10 |
| 18 | Timelash | 1971-02-17 |
| 19 | Ordeal | 1971-04-14 |
| 20 | Court Martial | 1971-05-01 |
| 21 | Computer Affair | 1971-05-15 |
| 22 | Confetti Check A-O.K. | 1971-07-10 |
| 23 | The Sound of Silence | 1971-07-17 |
| 24 | Reflections in the Water | 1971-07-24 |
| 25 | The Responsibility Seat | 1973-03-08 |
| 26 | The Long Sleep | 1973-03-15 |
