John Koenig: It's better to live as your own man than as a fool in someone else's dream.
John Koenig: We're all aliens, until we get to know one another.
Lee Russell: Nobody dies. Matter never dies, Helena. It changes its form.
Balor: How can you value life if you do not fear death?
John Koenig: We've had a lot of success so far. We know what dangers to expect out there from black suns, neutron storms, radiation and the like, but if we think we know everything that goes on out there, we're making a terrible mistake!
Helena Russell: With a history like that, who wants to go back to Earth anyway?
Maya: You mean, people killed people, just because they were different from each other? That's disgusting.
John Koenig: If we understand others, in time, I believe, we come to understand ourselves.
Commander John Koenig: Now we're sitting on the biggest bomb man's ever made.
Commander John Koenig (voice over) : A giant leap for mankind. It's beginning to look like a stumble in the dark.
John Koenig: Is it death that gives a meaning to life, in the end? Capt Jack Tanner: If there is an end.
John Koenig: A killer who can't be killed.
Helena Russell: I remember. A world without fear. It was very strange. Beautiful. We've lost it.
Prof. Victor Bergman: (last message before evacuating Alpha) We are Mankind. We came from planet Earth, and we built this base, called Alpha, to learn more about space. But human error blasted this Moon out of the Earth's orbit. And so, we have traveled the Universe searching for a place to live. Now, we can no longer live here, and we go to face an uncertain future on the planet that has nearly destroyed us. You, whoever you are, who find this empty vessel of Alpha, come and seek us out, if we still exist. Come and teach us all you know. Because, we have learned many things, but most of all, we have learned we still have much to learn.
Sandra Benes: Why has all of this happened to us, Professor? Prof. Victor Bergman: The gods using us for their sport, perhaps?