Alpha-beboerne kommer i kamp med en klippeblok, der udstråler vilje og intelligens og som kæmper for sin mulighed for at overleve.
A small planet is detected in range of the Moon. When the presence of the rare element milgonite is detected by Alpha's computer, a survey Eagle is dispatched to locate it, and bring some back.
Koenig leads the survey team, including Helena, Maya, Tony, Alan, and Geologist David Reilly. During the flight to the planet, Reilly (an Irishman transplanted to Texas, who sees himself as a bit of a cowboy) starts flirting with Maya, much to Tony's dismay.
They land, and it's back to work. Looking where they believe the milgonite deposits are located, they find no traces of milgonite, but do find an unusual glowing rock formation. In order to study it, they blast a piece off with a stun gun. There is a sound like a scream, and when they examine the rock, it appears to be bleeding. They bring it back to the Eagle to run more tests.
Tony attempts to look at it, and is struck by a flash of light. Helena examines him and he is dead. But when she hooks his body up to the medical monitors, they record normal brain activity. She tries to restart his heart with no success.
Koenig orders them to get rid of the rock, but Maya and Helena argue that, if they are going to help Tony, the answers they are looking for are linked to the rock.
Reilly leaves to continue his search for milgonite. Koenig has Carter join him, then he and Maya catch up with them in the cavern. He can still find no traces of the milgonite reported by the computer. He checks the fluid from the rock and discovers that it has blood corpuscles.
Back on the Eagle, Helena is alone with Tony and the rock. She is watching the rock apprehensively, when Tony sits up on the table behind her. Tony is struck by another flash of light, and leaves the Eagle.
Helena contacts Koenig to let him know that Tony has left. The others go to look for him, but he returns to the cavern, shoots off another piece of the rock, and brings it back to the Eagle. He sets it by the first piece and lies back down on the table. Helena tries to talk to him to no avail. The two pieces of rock fuse themselves together.
The others return to the ship after discovering that Tony had taken another piece from the parent rock. Helena tells them what happened, and John decides to leave the planet and dump the rock in space.
When they try to liftoff, they learn that all the Eagle's systems are dead. When John tries to get rid of the rock, it hits him with a flash of blue light causing paralyzing pain.
They sense that the rock has a purpose, but can't figure out what it wants. With an hour and 45 minutes before the Moon moves out of range, they have to find some answers fast. They return to the cave, and Koenig lets Maya tranform into a rock to attempt to communicate with it, but the rock does not respond.
Helena contacts John to tell him that the rock has changed color to green. He tells her to get out, but the rock won't let her. The rock starts searching the Eagle with the green light. It locates their stores of water and absorbs it all.
That was what it wanted all along. All the rocks had drained the planet dry. When there was no more water, they started to die off. The rock takes control of the Eagle and lifts off.
It only gets a little way before it lands again. Apparently it can't leave the rest of itself behind. It starts searching the Eagle's computer for star charts. Koenig believes that it will activate Tony again to collect more of the parent rock. He decides to try to stun Tony to see if that will break the rock's control over him.
Helena notifies them that Tony has left the Eagle, and they wait for him in the cavern. When he arrives, he blasts off another piece of the parent rock. Before he can bring it back to the Eagle, they stun him and he vanishes. He re-appears back on the Eagle and awakens free of the rock's control.
Koenig decides to try to use Tony's commlock, which was left when he transported, to open the Eagle door to get them out. When they look for it again, it's gone. Reilly took it to try to rescue Helena and Tony. He manages to get them out, but is stunned by the rock before he can use his laser on it.
The rock takes him over to gather more of itself. After having Maya modify a stun gun to fire four beams at once, Koenig has her transform into a rock again so that Reilly will bring her back to the Eagle, instead of more of the parent rock.
John and Alan follow him back, and get in the door before it closes. The rock stuns them as Reilly puts Maya, in rock form, next to the other. It starts to pull her closer to begins the fusing process. Maya is able to tell Koenig that the rock is using most of it's energy to fuse her, and that they should be able to break free of it. They do, but the rock turns red and tries to hit them with a red light. Maya tells them that red is the color that kills.
Koenig fires the modified stun gun and dehydrates the rock, saving Maya, and freeing Reilly, and the Eagle, of the rock's control. They call Tony and Helena back to the Eagle and prepare to leave. They toss the rock out and lift off. They are almost out of range of the Moon.
As the Eagle climbs, they discuss the fate of the rock. It will die within hours if it doesn't get water. They realise that it did not want to hurt them, it just wanted to survive. As they approach the heavy cloud cover, Helena comments that it's too bad that the clouds won't give up their water in time to save the rock.
Maya says they can make it rain by dropping nucleoid crystals into the clouds. John gives the "ok" and they jettison the crystals from the bottom of the Eagle. It thunders and starts to rain over the rock. Reilly muses that they didn't get away with any milgonite, and Helena responds that they did get away with their lives.
They continue back to Alpha with virtually no time to spare.
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