Grim danger emerges from the past as Alpha is threatened with destruction from an unmanned spacecraft. The ship was sent up from Earth many years earlier with tragedy in its wake. If this threat wasn't enough, victims from outer space threaten revenge.

The episode was rated 7,12 from 74 votes.

The people of Alpha are faced with a very strange phenomenon as they find themselves copied and encounter their future selves on Earth. The unspoken question is how long will this last and what does it mean for the Alphans..?

The episode was rated 7,13 from 39 votes.

People originating from a dying planet land on the moon and tell the Alphans that their spacecraft has been programmed to take them to Earth. With room on their ship to take one of the base's personnel, Koenig faces a dramatic decision..

The episode was rated 7,13 from 45 votes.

Koenig leads a team to investigate a ship which resembles one launched from Earth years earlier that has landed on the moon. The ship is found deserted save for a mobile computer named Brian, who soon leads the Alphans into a dangerous situation.

The episode was rated 7,15 from 40 votes.

A faster-than-light Super Swift ship arrives at Alpha, bringing friends and relatives and raising hopes that they will all be able to go home soon. But Koenig, recuperating from a brain injury, sees only hideous aliens in the visitors.

The episode was rated 7,16 from 31 votes.

Commander Koenig encounter a woman named Arra, who is older than Earth itself but breathtakingly beautiful as well. Is it destiny that the two met or something more? It all happens when the Moon is on a collision course with a planet many times its size.

The episode was rated 7,26 from 117 votes.

A terrifying force from Outer Space brings freezing death to Alpha personnel. One man has been chosen as the instrument of destruction.

The episode was rated 7,28 from 158 votes.

Commander Koenig and his colleagues speed through space and time into a chilling world of ice. However, once there, they encounter people who appear to be former inhabitants of earth stranded there when their expedition crashed on the planet they call Ultima Thule.

The episode was rated 7,28 from 75 votes.

Moonbase Alpha finds itself at war with an unnamed planet. The outcome is disastrous. Everything is wrecked. But can there be a future for the survivors on the aggressor planet?

The episode was rated 7,30 from 83 votes.

The Alphans encounter an eerie graveyard of lost spaceships that may be the result of encounters with a deadly monster in outer space. Is the threat real or imagined? Koenig must determine the truth before it may be too late....

The episode was rated 7,30 from 69 votes.

Alpha needs titanium to repair its life support system and traces of it are located on the planet Psychon that is near to the moon. However, Koenig and the others soon learn of a sinister mining operation operating beneath Psychon's surface and what it may spell for the Alphans.

The episode was rated 7,33 from 58 votes.

A mysterious power from an alien planet takes control of Alpha with the intent of luring its inhabitants to a paradise of eternal peace but also a place of living death. Commander Koenig is the only one capable of saving the Alphans from a terrible fate.

The episode was rated 7,34 from 50 votes.

The moon base personnel find themselves on a collision course with an asteroid. However, the asteroid is deflected by a greater threat: an all-devouring black sun that will destroy Alpha unless things changes rapidly.

The episode was rated 7,36 from 58 votes.

In distant outer space, the Moon's random careening comes to a sudden halt as the Alphans discover what looks to be origins of life on Earth itself. Could this discovery spell the end of the Moon or the beginning of a new life for the Alphans?

The episode was rated 7,36 from 44 votes.

Suspected radiation from nuclear waste containers threatens a deep space probe from Earth's space research center on the moon. It is a prologue to disaster and mankind's most fantastic adventure.

The episode was rated 7,55 from 211 votes.