UFO

SHADO officially goes into operation and encounters its first UFO.

When a civilian pilot inadvertently witnesses a SHADO operation, he is given a choice: join SHADO or die.

Straker faces a terrible decision: attend to an alien defector or deliver medicine to his injured son.

Straker and Foster investigate an undersea alien base.

Communications problems at Moonbase are traced to a non-SHADO mining operation.

After Lunar Module 32 is destroyed, Straker campaigns to have space junk removed from Earth's orbit.

A flashback episode focusing on SHADO's formation and how it caused the failure of Straker's marriage.

Straker must face his claustrophobia when the Skydiver submarine is damaged and unable to surface.

The aliens transform three humans into walking bombs.

Colonel Foster is tried and sentenced to death after a security leak is traced to him.

SHADO and an alien find themselves in the midst of a murderous romantic triangle.

Time stands still at the film studio for everyone but Straker, Colonel Lake and a mysterious enemy.

Foster is stranded on the Moon, where he befriends a similarly stranded alien.

A SHADO investigation reveals that romance may be complicating Moonbase operations.

SHADO obtains what may be the first photos of the alien home world.

An alien crystal causes Lieutenant Andy Conroy, Straker and other SHADO operatives to hallucinate.

A SHADO interceptor pilot is placed under a hypnotic spell by an alien-influenced cat.

The aliens attack a Royal Navy destroyer that is dumping containers of highly toxic nerve gas in the sea.

A show jumper is abducted by the aliens.