Imagine watching your home go up in flames. Everything you love and own, going up in smoke. What would you give to go back to before the fire?

Now, picture a crew of space shuttle astronauts watching from orbit as the Earth is obliterated. Nothing is left but their memories.

But all is not lost. An alien named The Seeker suddenly shows up and gives them the name of the monster responsible for the destruction: Leviathan.

He also gives them the opportunity to change the Earth's fate. The Seeker will send their minds back five years and into their younger bodies.

And so, with a head start and the name Leviathan, the crew sets off to save humankind.

Peter Weller plays Chuck Taggart, commander of the shuttle crew. Taggart must again try to repair fissures in his family. Of course, now he knows that they will be torn apart unless he can find new ways to resolve things.

The rest of the crewmembers are in similar situations.

Christopher Gorham plays Neil Taggart, Chuck's son, the only one of the group who must deal with returning to his teen years. Tamara Craig Thomas portrays Angela Perry, who must watch her father sink into the blackness of corruption while serving as a U.S. senator.

Sebastian Roche′ plays pessimist Kurt Mendel, a scientist who would rather coast to the end; and Leslie Silva plays reporter Sara Forbes, trying to save her young son from a fatal cancer.

And ever-present around them, the threat of Leviathan.