Space 1999

Commander John Koenig, the new commander of Moonbase Alpha, leads the investigation of a mysterious disease at the station and uncovers evidence of a far greater looming disaster.

A wandering energy force inhabits the body of Alpha technician Anton Zoref, turning him into an energy absorbing being.

After destroying an asteroid on a collision course with the moon, an even larger obstacle appears - an entire planet! On a recon mission, John Koenig encounters an inhabitant who convinces him- on the basis of faith- that the moon and the planet must collide. But no one else supports Koenig's stand.

Moonbase Alpha is attacked and devastated by warships from a nearby planet. With half of its population dead Alpha can no longer survive. Commander Koenig and Dr. Russel go to the alien world to plead for the survivors, but the inhabitants wish no one to disturb their serene existence.

On the ice world of Ultima Thule the Alphans encounter members of lost earth expedition who have achieved immortality- but at a price!

The Alphans encounter the Voyager space probe that has been wandering the cosmos propelled by the Queller drive- a faulty engine system. Following the probe is a fleet of alien ships from a world devastated by the drive.

The Alphans' joy turns to horror when the first child born on the Alpha matures into a five year old in a matter of hours. This is only a prelude to the arrival of formless alien fugitives- who plan to inhabit Alpha's population.

Discredited eagle pilot Tony Cellini is beset by recurring nightmares in which he was the only survivor of disastrous space mission. Now the moon is approaching the same set of circumstances that Cellini encountered.

The Alphans encounter a miles-long ark from the planet Daria, where the inhabitants have a very distinctive class separation.

The Alphans take drastic measures to prevent the traveling moon from drifting into a black sun.

Contact is made with the planet Piri, where the main computer created an idyllic life that led to extinction of its population through apathy. Now John Koenig must fight to save Alpha as his people fall under the same fate.

While exploring a cavern in an asteroid, the Alphans release Balor, a sadistic alien who has achieved immortality.

Dr. Russell's presumed-dead husband mysteriously reappears on a reconnaissance mission to a nearby planet.

Simmonds forces Koenig to let him take the place of a dead alien on an Earthbound ship.

While exploring an Earth-type world several Alphans, including Commander Koenig and Dr. Russel, disappear after sighting a strange fog. Shortly afterwards a race of primitive humans are encountered.

A sudden acceleration creates a duplicate moon complete with replicas of the crew.

Communication from another planet dashes the crew's hopes of settling on a planet similar to Earth.

Helena and Koenig are imprisoned on a spacecraft to serve a machine for the rest of their lives.

Maintenance technician Fred Clifford is possessed by an eerie yellow glow, which ultimately kills him. It transpires that it is coming from a planet called Triton, which captures the Alphans and insists that Helena should become the Eyes of Triton.

Koenig's soul is captured and scrutinized by an alien living there.

Koenig decides to use explosives to prevent a collision with an unseen intelligence.

Dan Mateo, the Alphans' botanist, believes that he can communicate telepathically with his plants but collapses. He comes to and appears to be fit and well but he is turning into a murderous and disfigured ghost who has been taken over by an alien manifestation.

Koenig is faced with a tough choice when Moonbase Alpha's orbit ceases.

Koenig arranges a cease-fire between warring planets when Moonbase Alpha is caught in their fire.