After crashing his Eagle, Koenig is dragged unconscious from the blazing wreckage and hooked up to the brain impulse machine. Meanwhile, a faster-than-light ship arrives on the Moon. It is the "Superswift" - a craft that was on the drawing board when the Moon broke away. Everyone in the Superswift's crew seems to be known by one Alphan or another, Tony's brother Guido, announces that transports will soon be coming from Earth to rescue the Alphans. But when Koenig regains consciousness, he sees not fellow Earth men, but only hideous aliens. When the aliens discover that one of the Alphans is able to see them, they plan to kill him..
John Koenig takes an Eagle to check reports of a surge in the neutron count near the nuclear waste domes. He begins flying erratically, and when Tony tries to contact him, he is irrational and unresponsive. Unable to remotely control his Eagle, they watch helplessly as he flies dangerously close to the nuclear waste domes. Koenig's Eagle strikes an antenna on one of them, and loses control. He crashes, but manages to put on his helmet before losing consciousness.
A rescue Eagle is dispatched, with a few nuclear physicists sent along to check for any damage that the crash may have caused. Koenig is pulled from the Eagle, and there are no signs of complications from the impact with the domes. Koenig is rushed back to Medical Center, where Helena has him hooked to an Ellendorf Quadrographic Brain Complex. Although an experimental technology, Helena feels this may be Koenig's only chance for a full recovery.
Back in Command Center, Sandra reports a sensor contact, that turns out to be a ship moving towards Alpha at faster-than-light speeds. When in visual range, the ship is revealed to be a Super-Swift originating from Earth. It moves in to land. Tony has Alpha's lasers aimed at the ship, but Sandra receives a transmission from the vessel and puts it on the big screen.
Tony recognizes the captain of the vessel as his brother Guido!
Clive Kander records the reunion as the crew, which consists of close friends and family of several of the Alphans, disembarks and is reunited with their loved ones. On the Super-Swift with Tony's brother were; Helena's old tutor Dr. Shaw, Sandra's fiancé Peter Rockwell, Ben's fiancée Louisa, and an old flame of Koenig's named Diana Morris, among others.
Helena cringes at the thought of dealing with her, but Dr. Shaw leaves her to deal with Diana, who has been looking for John since she arrived.
Two of the visitors, leave Command Center, seemingly take control of a medical technician they see in a hallway, who returns Medical Center and attempts to kill Koenig by disrupting the brain complex that John is hooked up to. Dr. Vincent sees, on one of the remote medical monitors, that something is wrong with Koenig, but Louisa seems to have an hypnotic control over him, causing him to turn off the monitor. When Alan pulls Louisa away, her control is broken, and Ben runs to Medical Center and prevents Sandstrom from killing Koenig.
In Command Center, Tony catches Maya trying to sneak off, not wanting to disturb the big reunion. He tries to allay her fears, but Diana Morris interrupts. She insults Maya, then proceeds to flirt with Tony.
Maya transforms into a creature behind Diana, but Tony catches her, and she reverts before Diana is any the wiser.
Ben and Helena discuss the possibility of a connection between John's erratic behavior and Sandstrom's attempt on Koenig's life, but no evidence could be found to connect the two. Koenig wakes, and Helena tells him about the rescue ship. He listens with incredulity to her description of the Super-Swift's crew, until he realizes she is serious. He hugs her, and they proceed to Command Center to join the reunion.
When they arrive, John freezes upon entering, seeing, not the friends from Earth he was told about, but grotesque aliens. He orders their ship destroyed, but Tony countermands his order. He tries to shoot one of the creatures, but Helena stuns him before he can shoot Tony's brother.
Convinced that John is suffering from delusions, Helena puts him in restraints. Tony and Helena try to calm him, down, but he remains very agitated, and needs to be sedated. Maya contacts Tony telling him that Kander has locked himself in the Records Lab, put the emergency oxygen full on, jammed the door, and is wrecking the place. Maya tries to get him out, but oxygen is ignited in the struggle, and Kander dies.
Guido pushes Tony to select three people to return to Earth in a pilot ship, before the Earth starts to move out of range. Back in Command Center, Tony draws lots for the three lucky people. But the names he is reading are not the ones on the cards. He is clearly under the control of Guido and Dr. Shaw.
Tony checks on Koenig in Medical Center. John tries to convince them that he is rational, and that odds are against the rescue team all being friends and relatives, and the three picked to return to Earth being on the Nuclear Monitoring Team.
Sandra alerts Tony that the pilot ship is ready to lift off. John becomes agitated, and is sedated. The launch is watched in Command Center, and all over the base. Alan, Bartlett, and Erlich find that they are approaching Earth with little appreciable sense of time passing. They contact Alpha to let them know that Earth is in visual range, and can barely contain their excitement as they approach.
Dr. Shaw visits the unconscious Sandstrom, and plants a directive into his mind. Sandstrom wakes and breaks free of his restraints. Tony and Maya are on their way to show Koenig images from the pilot ship approaching Earth, to help convince him that things really are as they have been trying to tell him.
Tony is attacked by Sandstrom, and Maya transforms into a Kendo fighter, knocking out Sandstrom. Dr. Shaw enters Medical Center, where Koenig is still in restraints. John sees the repulsive creature approaching, and strains against the straps that bind him, unable to free himself. He watches helplessly as it moves in close...
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