Eight volunteers - a reporter, a crass contractor, a female anthropologist, an ecologist, a professor, and a botanist along with a pilot and a stewardess - board the 261-day Space Transport Weblow simulated space flight to test reactions to long-term confinement. Unfortunately, all are unaware of an alien stowaway from the destination planet Antheon, who isn't keen on the idea of colonists targeting its homeworld.
—statmanjeff