Egy óriási nukleárishulladék-lerakó felrobban a Hold felszínén, és kirepíti a Holdat a távoli űrbe, rajta az Alfa bázis teljes legénységével. Ez minden baj forrása.

The body of Anton Zoref is invaded by an unknown life force. The man soon manifests an uncontrollable ability to absorb energy. As the Alphans struggle to understand this mysterious force, Zoref's need becomes insatiable. Driven by instinct, he makes his way to the greatest source of energy on Alpha: the Nuclear Generating Plant.

The Moon is on a collision course with an enormous planet. On a scouting mission, Koenig encounters Arra, the Queen of Atheria. The aged monarch proclaims the collision is a preordained event and must occur for her people to evolve to a higher plane of existence. Now Koenig must convince his staff to have faith and do nothing in the face of apparent destruction.

A Triton bolygó kutató szondája ejti foglyul a Holdat, nem tudván, hogy anyabolygója már rég elpusztult.

A bázison rekedt egyetlen politikus, Simmonds körmönfont módon próbálja lenyúlni az arra tévedt jószándékú idegenek hajóján felszabaduló egyetlen helyet, hogy hazajusson a Földre. Szörnyű véget ér ő.

The automated Earth space probe Voyager One is approaching the Moon. With the radioactive exhaust from its engine certain to extinguish all life on Moonbase, the Alphans try to gain control and shut down the drive. Help comes when the probe's designer is found living on Alpha under an assumed name. However, Voyager is being followed by alien ships seeking revenge.

The Alphans celebrate the arrival of the first child born on the Moon. The blessed event sours when the infant grows into a five-year-old child in minutes. Trying to accept him, the Alphans do not notice that little Jackie Crawford is much more than he seems. When hostile spaceships approach the base, Koenig realises, too late, that the aliens have an agent on Alpha.

Egy hajdan volt civilizáció az emberek tökéletes kényelmén őrködő hátrahagyott gépezete kísérli meg megfosztani akaratától az Alfa teljes személyzetét. Nem sikerül, mert Koenig résen van.

Energiafaló MUF (Mysterious Unknown Force) költözik az ártatlan és jószívű Anton Zoref technikus testébe, aki ezek után rettenetes vámpírként ámokfutja végig a bázist. Megfagyott emberek, kialvó lámpák, sikoltozó nők a szoláriumban.

The travelling Moon drifts within range of a black sun. Pulled toward certain destruction by its inescapable gravitational force, the Alphans employ desperate measures to stay alive. As a lifeboat Eagle carries six persons to safety, the Moon plunges into the black sun, with only an experimental forcefield protecting Alpha.

Strange events befuddle the Alphans as they approach the planet Piri. When exploring its lifeless surface, Koenig encounters the seductive servant of the mysterious Guardian of Piri. She offers the wayward Alphans a life of peace and perfection. Realising the deadly truth behind the peace of Piri, Koenig struggles to free his people from the Guardian's influence.

A bázison álnéven bujkáló Queller professzor, a fokozottan veszélyes Queller-féle gyorsneutron meghajtás atyja váratlanul szembesül a tudóstársadalom felelősségével, amikor az Alfa keresztezi a Voyager szonda (semmi köze a NASA azonos nevű készségeihez!) és a nyomában lihegő bosszúszomjas idegenek útját.

A lush Earth-type planet holds the promise of a new home for the people of Moonbase Alpha. When the reconnaissance Eagle returns, it carries an unexpected passenger: Helena's husband, who died five years ago. The mysterious Lee Russell tells the Alphans that death awaits them on the new planet. The Alphans ignore his warning and unknowingly descend into a world of antimatter.

An alien spacecraft crashlands on the Moon, its passengers refugees from a dying world. As their destination is Earth, they generously offer to take one person with them when they depart. The scheming Commissioner Simmonds takes steps to ensure that he is the lucky individual chosen, even if it means destroying Alpha.

When exploring a habitable planet, members of the Alphan survey party vanish without a trace. Are they the victims of an indigenous tribe of Stone Age humanoids? The mystery deepens when a dead caveman is found to have capped teeth. Others soon notice the primitive cave chief and his mate bear an uncanny resemblance to the missing John Koenig and Helena Russell.

After an encounter with a space-time anomaly, the Alphans find their Moon back in the Solar System on a course to re-enter Earth orbit. The celebration ends when it becomes apparent Earth is an inhospitable wasteland. The mystery deepens when they discover a duplicate Moon already in orbit and a duplicate Moonbase Alpha lying empty and deserted.

Az igen fejlett civilizáció rettenetes látomásban mutatja meg az Alfa legénységének egy rossz döntés következményeit. Űrcsata, hatalmas rombolók, romokban heverő Alfa, végül totális pusztulás, mindeközben hosszas elmélkedések a világ folyásáról.

A napjuk két ellentétes oldalán elhelyezkedő bolygók népei kibékíthetetlen ellenségei egymásnak. Egyikük a rendszerbe érkező Holdat próbálja fegyverplatformként alkalmazni, de rajtaveszt.

A technician falls under an alien influence, accessing classified information before mysteriously dying. Soon after, the Moon is stopped in space by the powerful rays of an alien spacecraft. The aliens' only interest in Alpha is the data held in its computers, information they now plan to obtain through the possessed eyes of their next agent: Helena Russell.

A Hold egy hatalmas, világokat irányító agyon hatol keresztül. Az agy kétségbeesetten próbál kapcsolatot létesíteni az Alfával, de végül minden hiába, pusztulás és magukra maradt világok feltételezhető milliói a történet vége.

Egy mesterséges értelem irányította hajó és emberi kísérője érkezik, és megpróbálja lenyúlni a bázis erőforrásait, valamint a Koenig/Russel párost.

Dan Mateo, hoping to unlock the secret of communication with plants, unleashes a killing force from the depths of his own mind. This macabre spectre seeks vengeance for Mateo's horrible death—which has not yet occurred. Bridging the span between science and the supernatural, the Alphans hope to break the cycle and exorcise the ghost without killing the man.

The Moon approaches a solar system with two planets on opposites sides of its sun. The Alphans are trapped in an interplanetary conflict when warships from both worlds trespass on the Moon to fire missiles at their opponents' planets. After taking in a refugee from a destroyed gunship, the Alphans discover they have drifted into the middle of a literal war of the sexes.