For four years, the courageous crew of the NSEA Protector set off on thrilling and often dangerous missions in space ... and then their series was cancelled. Now, twenty years later, aliens under attack have mistaken the Galaxy Quest television transmissions for "historical documents" and beamed up the crew of has-been actors to save the universe. With no script, no director and no clue, the actors must turn in the performances of their lives.

Two banished angels have discovered a loophole that would allow them back into heaven. The problem is, they'd destroy civilization in the process by proving God fallible. It's up to Bethany, a lapsed Catholic who works in an abortion clinic, to save the day, with some help from two so-called prophets, the heretofore unknown 13th apostle, and a sexy, former muse.