| EP | EPISODE TITLE | RATING | TRANSMITTED | REVIEWS |
| 1 | Beachhead | *** | Jan 10 1967 | 
|
| 2 | The Experiment | ** | Jan 17 1967 |
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| 3 | The Mutation | * | Jan 24 1967 |
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| 4 | The Leeches | * | Jan 31 1967 |
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| 5 | Genesis | ***** | Feb 07 1967 |
|
| 6 | Vikor | *** | Feb 14 1967 |
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| 7 | Nightmare | **** | Feb 21 1967 |
|
| 8 | Doomsday Minus One | *** | Feb 28 1967 |
|
| 9 | Quantity: Unknown | **** | Mar 07 1967 |
|
| 10 | The Innocent | **** | Mar 14 1967 |
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| 11 | The Ivy Curtain | *** | Mar 21 1967 |
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| 12 | The Betrayed | **** | Mar 28 1967 |
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| 13 | Storm | **** | Apr 04 1967 |
|
| 14 | Panic | *** | Apr 11 1967 |
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| 15 | Moonshot | ***** | Apr 18 1967 |
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| 16 | Wall of Crystal | ***** | May 02 1967 |
|
| 17 | The Condemned | *** | May 09 1967 |
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| EP | EPISODE TITLE | RATING | TRANSMITTED | REVIEWS |
| 18 | Condition: Red | **** | Sep 05 1967 |
|
| 19 | The Saucer | **** | Sep 12 1967 |
|
| 20 | The Watchers | ** | Sep 19 1967 |
|
| 21 | Valley of the Shadow | ***** | Sep 26 1967 |
|
| 22 | The Enemy | *** | Oct 03 1967 |
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| 23 | The Trial | ***** | Oct 10 1967 |
|
| 24 | The Spores | * | Oct 17 1967 |
|
| 25 | Dark Outpost | ** | Oct 24 1967 |
|
| 26 | Summit Meeting, Part 1 | *** | Oct 31 1967 |
|
| 27 | Summit Meeting, Part 2 | **** | Nov 07 1967 |
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| 28 | The Prophet | ** | Nov 14 1967 |
|
| 29 | Labyrinth | *** | Nov 21 1967 |
|
| 30 | The Captive | **** | Nov 28 1967 |
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| 31 | The Believers | **** | Dec 05 1967 |
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| 32 | The Ransom | *** | Dec 12 1967 |
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| 33 | Task Force | **** | Dec 26 1967 |
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| 34 | The Possessed | *** | Jan 02 1968 |
|
| 35 | Counterattack | **** | Jan 09 1968 |
|
| 36 | The Pit | ***** | Jan 16 1968 |
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| 37 | The Organization | *** | Jan 30 1968 |
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| 38 | The Peacemaker | **** | Feb 06 1968 |
|
| 39 | The Vise | *** | Feb 20 1968 |
|
| 40 | The Miracle | ** | Feb 27 1968 |
|
| 41 | The Life Seekers | **** | Mar 05 1968 |
|
| 42 | The Pursued | *** | Mar 12 1968 |
|
| 43 | Inquisition | **** | Mar 26 1968 |
|