The crew of the ship Serenity try to evade an assassin sent to recapture one of their members who is telepathic.
Mere seconds before the Earth is to be demolished by an alien construction crew, journeyman Arthur Dent is swept off the planet by his friend Ford Prefect, a researcher penning a new edition of "The Hitchhiker's Guide to the Galaxy."
An alien narrates the story of his dying planet, his and his people's visits to Earth and Earth's man-made demise, while human astronauts attempt to find an alternate planet for surviving humans to live on.