Under arbejdet på en ny planet, kommer Alpha-folkene i kontakt med et væsen skabt af anti-stof.
Young Shermeen Williams is helping Tony cultivate hops and barley, in Hydroponics for use in brewing his beer. During the course of their collaboration she has developed a crush on him much to the chagrin of her co- worker, and would-be suitor, Eddie Collins.
After bringing the latest brew to Command Center to be sampled by his unwilling compatriots, Tony takes a swig of his beer to find that it did not live up to his expectations. Frustrated, he inadvertently hurts Shermeen's feelings. She runs from Command Center crying, much to Tony's surprise.
In her quarters, she stops crying when she senses something in the room with her. She looks and sees a man's face staring at her from the corner of her room. Helena, who followed her from Command Center to check on her fragile emotional state, finds her disturbed by what she believes was a dream. She gives her a tranquilizer and lets her return to duty.
Back in Command Center, a planet is detected. Koenig asks Helena to join them for a landing party but she is in the middle of some tests and can't go. She tells John about Shermeen, and when he says he wants her to join the team to go to the planet, Helena advises against it.
Tony is elected to give the news to Shermeen. She assumes he told them not to let her go and tells him she never wants to see him again. He leaves and the face returns. He tells her that his name is Vindrus, and he comes from the planet Sunim, and that she will see the planet soon. She tells him that she is not going, but he tells her that if she does as he says, she will. He has her bombard a seed with protons and plant it, then tells her to prepare to go to the planet. She leaves as Eddie Collins returns. The seed grows to maturity at incredible speed. Eddie notices the plant, and when he smells one of the flowers, falls unconscious.
As the landing party prepares to embark, they find Shermeen who tells Koenig that Eddie was suddenly taken ill. They fly to Sunim to check it out. and arrive to find a completely Earth-like planet, but with no animal life detectable on their sensors.
Shermeen wanders off getting samples of the different plants. Vindrus leads her to a temple which has already been discovered by the rest of the team, but as they approach they are charged by a large horned creature. When John fires on it, the laser beam is deflected. They run for the cover of the woods. As they retreat, Koenig notices the creature has stopped at the obelisk at the edge of the wood.
They look for Shermeen who is told to enter the temple past the creature. Vindrus assures her that it will not attack. She enters the temple unscathed, where Vindrus tells her that he needs her help to cross over into our world, and asks her to take a cylinder back to Alpha. Bill finds Shermeen's footprints leading towards the temple.
Maya changes into a fox to evade the creature, and get into the the structure to see if Shermeen is within. Maya finds her, and after recording the images on the wall, leads her out. Maya hesitates, when she sees the creature, but is told by Shermeen that the creature will not harm them.
Unable to contact Alpha, Koenig decides to return to the base. On the way back, he asks Shermeen why she was able to get past the creature. She tells him that no harm will come to her on Sunim. He asks how she knew the name of the planet. She becomes defensive and he backs off.
On Alpha they review Maya's tapes, and come to the conclusion that the creature that they saw on the planet was made up of anti-matter. Vindrus appears to Shermeen and asks her to get a generator, that will fit the cylinder, to bring to the planet. Tony walks in and sees Vindrus. He is knocked out and made to forget what he has seen.
Shermeen gets a generator and, using a flower hypnotizes Bill into taking her to Sunim. Vindrus has her hook up the generator to a matter converter. Then has her step into one of two booths. Vindrus locks her in and trades places with her, sending her into the anti-matter world while he enters the matter world.
Koenig, Tony and Maya who had followed them to the planet, arrive at the temple. Vindrus exits the temple after Koenig figures out that the creature cannot harm them. They learn that he is no longer anti-matter. Koenig asks where Shermeen is. Vindrus tells them she is inside the temple and won't come out. He suggests they go in and get her.
John and Tony follow him in and Vindrus seals the door to the temple. Tony remembers that Vindrus needed people to maintain the balance for the transfer into the matter world. Tony shoots Vindrus but the beam bounces off. Vindrus demonstrates that he does have an effective weapon, and orders them into the conversion booths.
Koenig throws his commlock at Vindrus, and he and Tony hide. While Vindrus looks for them, Maya who heard the commotion, has gotten into the temple as a small monkey. John tells Vindrus that Shermeen is coming back because he knew what Vindrus was up to, and set the generator to work at partial power.
Maya transforms into Shermeen and enters one of the booths. She calls to Vindrus telling him that they need to try again or they will all be destroyed. Vindrus approaches the booth, Tony pushes him in, and John bars the door shut. Maya exits and turns the converter on. She can't recall the controls of the one she had seen before, but Shermeen is able to guide her, and the conversion is reversed.
John sets the reactor to overload. Tony finds the button to open the door and they head back to the Eagles. Before they can lift off, the generator explodes and the Planet is returned to anti-matter.
Back on Alpha, Shermeen returns Tony's hops, as she needs the room to test a theory Eddie Collins has on plant growth. Tony is dumbfounded at her sudden change of heart, but is soon distracted with musings of brewing beer with anti-matter grain and/or hops.
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