History Undercover Season 4 Episode release dates & where to watch

1. Clouds of Death: The Scourge of Biochemical Warfare

Terrorists find chemical and biological weapons a cost-effective alternative to nuclear arms.

2. The Doomsday Flu

The influenza epidemic of 1918 kills 22 million people worldwide.

3. The Port Chicago Mutiny

Fifty black sailors rebel in protest of unsafe working conditions after two ammunition ships blow up in port during World War II.

4. Kennedy and Nixon

Friendship between JFK and Richard Nixon becomes intense rivalry.

5. Duel in the Desert

North African theater of war; El Alamein; Rommel vs. Montgomery.

6. Unit 731: Nightmare in Manchuria

The Japanese army seeks to develop biological weapons during World War II.

7. Deadly Crossing

Subs race to rescue men at sea; only 127 of the 2,000 survive.

8. Yanks for Stalin

In the Depression, U.S. executives tried to guide Soviet industry.

9. Banking With Hitler Finale

Banks from the United States, England and Switzerland helped fund the Nazi regime.

10. To the Edge of Space: Project Manhigh

Altitude tests take place in 1950s New Mexico.

11. The Rape of Nanking

The massacre at Nanking, when Japanese troops overcame a Chinese defense and slaughtered 350,000 prisoners and civilians.

12. Secret Luftwaffe Aircraft of WWII

The development of Hitler's airborne arsenal, including Luftwaffe's swept-wing and vertical take-off aircraft and stealth bombers.

13. The Ace: The Story of Johannes Steinhoff

A former Luftwaffe pilot moves up to become head of the West German Air Force.

14. Top Secret: Spy Planes of the Cold War

New information about secret spy plane missions flown over communist territories during the Cold War.

15. Inferno: The True Story of Dresden

Operation Thunderclap rained tons of bombs on Dresden, Germany.

16. The Last Cold Warrior

A Russian defector damages the KGB.

17. Churchill and the President

U.S. soldiers man the SIGSALY system in a London department store.

18. Mystery of the U2

The Soviets shoot down an American spy plane.

19. Code Name: Project Orion

In the 1950s, plans arise to send a giant, manned spaceship to other planets.

20. U.S.S. Iowa Explosion

A 1989 explosion on the USS Iowa kills 47 crew members.

21. The Secret Bunker

The secret duck-and-cover plan during the Cold War included underground bunkers which would have protected top officials if the Soviets attacked.

22. Pope John XXIII

A farmer's son becomes Pope John XXIII and stirs up an ecumenical hornet's nest.

23. John Paul I and His Mysterious Death

The sudden death of Pope John Paul I gives rise to rumours of a murder plot.

24. Pope John Paul II

Pope John Paul II does not allow compromise on moral issues.