The Department For the Observation and Measurement of Scientific Work, nicknamed Doomwatch, was set up by the government to monitor potentially dangerous research and avoid disasters caused by the misuse of technology.
Season One: 13 episodes
| Ep | PN | Airdate | Title |
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| 1 | | Feb 09/70(UK) | The Plastic Eaters |
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| 2 | | Feb 16/70(UK) | Friday's Child* |
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| 3 | | Feb 23/70(UK) | Burial at Sea* |
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| 4 | | Mar 02/70(UK) | Tomorrow, the Rat |
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| 5 | | Mar 09/70(UK) | Project Sahara |
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| 6 | | Mar 16/70(UK) | Re-Entry Forbidden |
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| 7 | | Mar 23/70(UK) | The Devil's Sweets |
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| 8 | | Apr 06/70(UK) | The Red Sky |
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| 9 | | Apr 13/70(UK) | Spectre at the Feast* |
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| 10 | | Apr 20/70(UK) | Train and De-Train |
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| 11 | | Apr 27/70(UK) | The Battery People |
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| 12 | | May 04/70(UK) | Hear No Evil* |
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| 13 | | May 11/70(UK) | Survival Code* |
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Season Two: 13 episodes
| Ep | PN | Airdate | Title |
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| 14 | | Dec 14/70(UK) | You Killed Toby Wren |
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| 15 | | Dec 21/70(UK) | Invasion |
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| 16 | | Jan 04/71(UK) | The Islanders |
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| 17 | | Jan 11/71(UK) | No Room For Error |
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| 18 | | Jan 18/71(UK) | By the Pricking of My Thumbs |
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| 19 | | Jan 25/71(UK) | The Iron Doctor |
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| 20 | | Feb 01/71(UK) | Flight Into Yesterday |
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| 21 | | Feb 08/71(UK) | The Web of Fear |
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| 22 | | Feb 15/71(UK) | In the Dark |
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| 23 | | Feb 22/71(UK) | The Human Time Bomb |
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| 24 | | Mar 01/71(UK) | The Inquest |
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| 25 | | Mar 15/71(UK) | The Logicians |
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| 26 | | Mar 22/71(UK) | Public Enemy |
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Season Three: 13 episodes
| Ep | PN | Airdate | Title |
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| 27 | | Jun 05/72(UK) | Fire and Brimstone* |
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| 28 | | Jun 12/72(UK) | High Mountain* |
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| 29 | | Jun 19/72(UK) | Say Knife, Fat Man* |
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| 30 | | Jun 26/72(UK) | Waiting For a Knighthood |
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| 31 | | Jul 03/72(UK) | Without the Bomb* |
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| 32 | | Jul 10/72(UK) | Hair Trigger |
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| 33 | | Jul 17/72(UK) | Deadly Dangerous Tomorrow* |
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| 34 | | Jul 24/72(UK) | Enquiry* |
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| 35 | | Jul 31/72(UK) | Flood* |
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| 36 | | Aug 07/72(UK) | Cause of Death* |
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| 37 | | Aug 14/72(UK) | The Killer Dolphins* |
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| 38 | | unaired | Sex and Violence |
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| | unfinished | The Devil's Demolition |
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| | Mar /72(UK) | Doomwatch (92 mins) |
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| | Dec 07/99(UK) | Doomwatch: Winter Angel (100 mins) |
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| *These episodes no longer exist due to the common practice at the time of wiping the master tapes for re-use |
