U.F.O

A grim secret is revealed with the coming of a visitor from outer space.

A civilian test pilot stumbles on a military secret and finds himself with a new career.

A Siamese cat brings sinister drama into the lives of a SHADO pilot and his wife.

Commander Straker is convinced space debris is being used to mask sinister alien activity.

Straker must choose between family and duty when his son faces death.

With his mind under the influence of the aliens, Croxley learns the secrets of SHADO.

A split-second decision that endangers the astronauts, ultimately saves them.

Straker discovers the perils of the deep can be more dangerous than invaders from space.

A Naval vessel shoots down a UFO in the Atlantic.

A woman intending to murder her husband discovers she has instead killed an alien.

Straker gets IAC backing to use a B142 space probe to follow a UFO to its origin.

Three members of the public gain superhuman abilities when they are possessed by aliens.

Foster's life is placed in jeopardy when his moon buggy is struck by an alien craft.

When a UFO mysteriously self-destructs, some Moonbase members begin to suffer delusions.

Aliens exploit a man's devotion to his wife to make him turn traitor.

A space pilot returns from two months' unexplained absence.

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

Time stands still - and Commander Straker runs amok. A lot can happen in a split second!

Foster finds the SHADO Centre under attack by aliens, then is dragged to their UFO.

Colonel Foster is accused of espionage.

The death of an astronaut has strange implications for those left behind.

SHADO causes Colonel Straker's marriage to hit the rocks.

A country family are troubled by a trespasser. But what are his origins?

The freighter 'Kingston' is sunk in mid-Atlantic by "flying fish" missiles and an underwater cameraman dies in mysterious circumstances.