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- 1Spearhead from Space, Part OneJanuary 3, 1970 · 9.2
- 2Spearhead from Space, Part TwoJanuary 10, 1970 · 8.9
- 3Spearhead from Space, Part ThreeJanuary 17, 1970 · 8.7
- 4Spearhead from Space, Part FourJanuary 24, 1970 · 8.8
- 5The Silurians, Part OneJanuary 31, 1970 · 9.0
- 6The Silurians, Part TwoFebruary 7, 1970 · 8.9
- 7The Silurians, Part ThreeFebruary 14, 1970 · 9.0
- 8The Silurians, Part FourFebruary 21, 1970 · 8.8
- 9The Silurians, Part FiveFebruary 28, 1970 · 8.9
- 10The Silurians, Part SixMarch 7, 1970 · 8.6
- 11The Silurians, Part SevenMarch 14, 1970 · 8.9
- 12The Ambassadors of Death, Part OneMarch 21, 1970 · 8.9
- 13The Ambassadors of Death, Part TwoMarch 28, 1970 · 9.0
- 14The Ambassadors of Death, Part ThreeApril 4, 1970 · 8.9
- 15The Ambassadors of Death, Part FourApril 11, 1970 · 8.8
- 16The Ambassadors of Death, Part FiveApril 18, 1970 · 8.8
- 17The Ambassadors of Death, Part SixApril 25, 1970 · 8.8
- 18The Ambassadors of Death, Part SevenMay 2, 1970 · 8.9
- 19Inferno, Part OneMay 9, 1970 · 9.1
- 20Inferno, Part TwoMay 16, 1970 · 8.9
- 21Inferno, Part ThreeMay 23, 1970 · 9.1
- 22Inferno, Part FourMay 30, 1970 · 9.0
- 23Inferno, Part FiveJune 6, 1970 · 9.0
- 24Inferno, Part SixJune 13, 1970 · 8.9
- 25Inferno, Part SevenJune 20, 1970 · 9.0