Secret History was a long-running British television documentary series. Shown on Channel 4, the Secret History brandname was used as a banner title in the UK, but many of the individual documentaries can still be found on US cable channels without the branding. It can be seen as Channel 4's answer to the BBC's Timewatch.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Hidden Hand | 1991-11-14 | 60 min |
| Season 1 | Episode 2 | The Unquiet Graves | 1991-11-21 | 60 min |
| Season 1 | Episode 3 | Ratlines | 1991-11-28 | 60 min |
| Season 1 | Episode 4 | Bloody Sunday | 1991-12-05 | 60 min |
| Season 1 | Episode 5 | Murder in Missippi | 1991-12-12 | 60 min |
| Season 1 | Episode 6 | Prisoners of Propaganda | 1991-12-19 | 60 min |
| Season 2 | Episode 1 | Deep Sleep | 1992-06-26 | 60 min |
| Season 2 | Episode 2 | Birds of Death | 1992-07-06 | 60 min |
| Season 2 | Episode 3 | Drowning by Bullets | 1992-07-13 | 60 min |
| Season 2 | Episode 4 | The Last Days of Aldo Moro | 1992-07-20 | 60 min |
| Season 2 | Episode 5 | The Hidden Holocaust | 1992-07-27 | 60 min |
| Season 2 | Episode 6 | Death of a Democrat | 1992-08-03 | 60 min |
| Season 2 | Episode 7 | Bad Blood | 1992-08-10 | 60 min |
| Season 2 | Episode 8 | The Robert Kennedy Assassination | 1992-08-17 | 60 min |
| Season 3 | Episode 1 | The Soviet Wives Affair | 1994-01-20 | 60 min |
| Season 3 | Episode 2 | White Lies | 1994-01-27 | 60 min |
| Season 3 | Episode 3 | The Dambusters' Raid | 1994-02-03 | 60 min |
| Season 3 | Episode 4 | Dead or Alive | 1994-02-10 | 60 min |
| Season 3 | Episode 5 | The Lynchburg Story | 1994-02-17 | 60 min |
| Season 3 | Episode 6 | Suicide Island | 1994-02-24 | 60 min |
| Season 4 | Episode 1 | The Battle of Goose Green | 1996-07-11 | 60 min |
| Season 4 | Episode 2 | The Whitechapel Murders | 1996-07-25 | 60 min |
| Season 4 | Episode 3 | The Voyage of the St. Louis | 1996-08-01 | 60 min |
| Season 4 | Episode 4 | Mutiny in the RAF | 1996-08-08 | 60 min |
| Season 4 | Episode 5 | Harold Wilson - The Final Days | 1996-08-15 | 60 min |
| Season 4 | Episode 6 | Konkordski | 1996-08-22 | 60 min |
| Season 5 | Episode 1 | Lords of the Underworld | 1997-06-23 | 60 min |
| Season 5 | Episode 2 | The Tragedy of HMS Glorious | 1997-06-30 | 60 min |
| Season 5 | Episode 3 | Breaking the Sound Barrier | 1997-07-07 | 60 min |
| Season 5 | Episode 4 | Gold Fever | 1997-07-14 | 60 min |
| Season 5 | Episode 5 | Spying for Love | 1997-07-21 | 60 min |
| Season 6 | Episode 1 | The Voyage of the Exodus | 1998-05-11 | 60 min |
| Season 6 | Episode 2 | The Porn King, the Stripper and the Bent Coppers | 1998-05-18 | 60 min |
| Season 6 | Episode 3 | The Chair | 1998-06-01 | 60 min |
| Season 6 | Episode 4 | Dad's Army | 1998-06-08 | 60 min |
| Season 6 | Episode 5 | Killer Flu | 1998-06-15 | 60 min |
| Season 6 | Episode 6 | The Berlin Airlift | 1998-06-29 | 60 min |
| Season 6 | Episode 7 | Purple Secret - In Search of Royal Madness | 1998-07-06 | 60 min |
| Season 6 | Episode 8 | Winter of Discontent | 1998-07-13 | 60 min |
| Season 6 | Episode 9 | Witch Hunt | 1998-07-20 | 60 min |
| Season 6 | Episode 10 | D-Day Disaster | 1998-07-27 | 60 min |
| Season 6 | Episode 11 | Kinsey's Paedophiles | 1998-08-10 | 60 min |
| Season 7 | Episode 1 | The Great Train Robbery | 1999-08-10 | 60 min |
| Season 7 | Episode 2 | The Hidden Jews of Berlin | 1999-08-17 | 60 min |
| Season 7 | Episode 3 | Hitler's Search for the Holy Grail | 1999-08-19 | 60 min |
| Season 7 | Episode 4 | Mau Mau | 1999-08-24 | 60 min |
| Season 7 | Episode 5 | The People's Duchess | 1999-08-31 | 60 min |
| Season 7 | Episode 6 | Sex and the Swastika | 1999-09-07 | 60 min |
| Season 7 | Episode 7 | The Bunny Girl | 1999-09-14 | 60 min |
| Season 7 | Episode 8 | Miracle on the River Kwai | 1999-09-21 | 60 min |
| Season 7 | Episode 9 | The Great Fog | 1999-09-28 | 60 min |
| Season 7 | Episode 10 | Execution at Camp 21 | 1999-10-05 | 60 min |
| Season 8 | Episode 1 | The Duchess and the Headless Man | 2000-08-10 | 60 min |
| Season 8 | Episode 2 | Funny Money | 2000-08-17 | 60 min |
| Season 8 | Episode 3 | Last Train from Budapest | 2000-08-24 | 60 min |
| Season 8 | Episode 4 | Prisoners of the Kaiser | 2000-08-31 | 60 min |
| Season 8 | Episode 5 | Mutiny - The True Story of the Red October | 2000-09-07 | 60 min |
| Season 8 | Episode 6 | Natural Born Americans | 2000-09-14 | 60 min |
| Season 8 | Episode 7 | Children of the Iron Lung | 2000-09-21 | 60 min |
| Season 9 | Episode 1 | Orphans of the Airlift | 2001-08-09 | 60 min |
| Season 9 | Episode 2 | The Search for the Struma | 2001-08-16 | 60 min |
| Season 9 | Episode 3 | The Lost Legions of Varus | 2001-08-23 | 60 min |
| Season 9 | Episode 4 | Television in the Third Reich | 2001-08-30 | 60 min |
| Season 9 | Episode 5 | Wartime Crime | 2001-09-06 | 60 min |
| Season 9 | Episode 6 | Spanish Armada | 2001-09-13 | 60 min |
| Season 9 | Episode 7 | The Falklands - Exocet! | 2002-01-05 | 60 min |
| Season 10 | Episode 1 | The Charge of the Light Brigade | 2002-06-06 | 60 min |
| Season 10 | Episode 2 | The Comet Cover-Up | 2002-06-13 | 60 min |
| Season 10 | Episode 3 | Witchfinder General | 2002-06-20 | 60 min |
| Season 10 | Episode 4 | Magic at War | 2002-06-27 | 60 min |
| Season 10 | Episode 5 | The Crucified Soldier | 2002-07-04 | 60 min |
| Season 10 | Episode 6 | The War That Made the Nazis | 2002-07-11 | 60 min |
| Season 10 | Episode 7 | Horror on the Home Front | 2002-07-18 | 60 min |
| Season 10 | Episode 8 | Dogfight - The Mystery of the Red Baron | 2002-07-25 | 60 min |
| Season 11 | Episode 1 | Brighton Bomb | 2003-05-15 | 60 min |
| Season 11 | Episode 2 | Hitler of the Andes | 2003-05-22 | 60 min |
| Season 11 | Episode 3 | Costa del Crime | 2003-05-29 | 60 min |
| Season 11 | Episode 4 | The Affair | 2003-06-05 | 60 min |
| Season 11 | Episode 5 | The Strangest Viking | 2003-06-12 | 60 min |
| Season 11 | Episode 6 | The Nazi Officer's Wife | 2003-06-19 | 60 min |
| Season 12 | Episode 1 | Beasts of the Roman | 2004-06-07 | 60 min |
| Season 12 | Episode 2 | Britain's Boy Soldiers | 2004-06-14 | 60 min |
| Season 12 | Episode 3 | The Royal Mummy | 2004-06-21 | 60 min |
| Season 12 | Episode 4 | Sex Bomb | 2004-06-28 | 60 min |
| Season 12 | Episode 5 | Sink the Belgrano | 2004-07-05 | 60 min |
| Season 12 | Episode 6 | The Nazi Expedition | 2004-07-12 | 60 min |
| Season 13 | Episode 1 | Tutankhamun: The Mystery of the Burnt Mummy | 2013-11-10 | 60 min |
| Season 13 | Episode 2 | Queen Victoria and the Crippled Kaiser | 2013-11-17 | 60 min |
| Season 13 | Episode 3 | Finding Babylon's Hanging Garden | 2013-11-24 | 60 min |
| Season 13 | Episode 4 | New Secrets of the Terracotta Warriors | 2013-12-08 | 60 min |
| Season 13 | Episode 5 | The Dambusters' Great Escape | 2014-03-30 | 60 min |
| Season 13 | Episode 6 | Return of the Black Death | 2014-04-06 | 60 min |
| Season 14 | Episode 1 | The Real Noahs Ark | 2014-09-14 | 60 min |
| Season 14 | Episode 2 | Hitler's Hidden Drug Habit | 2014-10-19 | 60 min |
| Season 14 | Episode 3 | World War I's Forgotten Heroes | 2014-11-02 | 60 min |
| Season 14 | Episode 4 | The Great Wall of China: The Hidden Story | 2014-11-30 | 60 min |
| Season 14 | Episode 5 | London's Lost Graveyard - The Crossrail Discovery | 2015-07-19 | 60 min |
| Season 14 | Episode 6 | Prince Philip: The Plot to Make a King | 2015-07-30 | 60 min |
| Season 14 | Episode 7 | Hunt for the Arctic Ghost Ship | 2015-08-04 | 60 min |
| Season 14 | Episode 8 | The Other Prince William | 2015-08-05 | 60 min |
| Season 14 | Episode 9 | First Humans: The Cave Discovery | 2015-09-27 | 60 min |
| Season 14 | Episode 10 | Cleopatra's Lost Tomb | 2015-10-04 | 60 min |
| Season 14 | Episode 11 | China: Treasures of the Jade Empire | 2015-10-18 | 60 min |
| Season 14 | Episode 12 | The Sex Change Spitfire Ace | 2015-10-25 | 60 min |
| Season 14 | Episode 14 | Britain's Medieval Vampires | 2015-10-31 | 60 min |
| Season 15 | Episode 1 | Shakespeare's Tomb | 2016-03-26 | 60 min |
| Season 15 | Episode 2 | The Mystery of the Crossrail Skulls | 2016-04-24 | 60 min |
| Season 15 | Episode 3 | Jutland: WWI's Greatest Sea Battle | 2016-05-11 | 60 min |
| Season 15 | Episode 4 | Messages Home: Lost Films of the British Army | 2016-06-26 | 60 min |
| Season 15 | Episode 5 | China's Forgotten Emperor | 2016-07-03 | 60 min |
| Season 15 | Episode 6 | Saddam Goes to Hollywood | 2016-07-24 | 60 min |
| Season 15 | Episode 7 | Heroes of Helmand: The British Army's Great Escape | 2016-08-16 | 60 min |
| Season 15 | Episode 8 | Secrets of a Police Marksman | 2016-08-18 | 60 min |
| Season 15 | Episode 9 | Last Heroes of the Somme | 2016-11-13 | 60 min |
| Season 15 | Episode 10 | Pearl Harbour The New Evidence | 2016-12-10 | 60 min |
| Season 16 | Episode 1 | Titanic: The New Evidence | 2017-01-01 | 60 min |
| Season 16 | Episode 2 | Dunkirk - The New Evidence | 2017-07-02 | 60 min |
| Season 16 | Episode 3 | Secrets of China's Forbidden City | 2017-07-09 | 60 min |
| Season 16 | Episode 4 | Britain's Forgotten Army | 2017-11-12 | 60 min |
| Season 17 | Episode 1 | Holocaust: The Revenge Plot | 2018-01-27 | 60 min |
| Season 17 | Episode 2 | Secrets of the 10,000 Year Old Man | 2018-02-18 | 60 min |
| Season 17 | Episode 3 | Hannibal's Elephant Army: The New Evidence | 2018-02-25 | 60 min |
| Season 17 | Episode 4 | Churchill's Secret Affair | 2018-03-04 | 60 min |
| Season 17 | Episode 5 | Jesus' Female Disciples: The New Evidence | 2018-04-08 | 60 min |
| Season 17 | Episode 6 | Lost Cities of the Maya: Revealed | 2018-02-11 | 60 min |
| Season 18 | Episode 1 | Skeletons of the Mary Rose: The New Evidence | 2019-03-17 | 60 min |