 Dr. Paul Sorenson, a noted astronomer, believes that an approaching comet will collide with earth based on his study of an ancient civilization s prophetic timeline. Frustrated by his inability to convince other scientists of the threat, Sorenson and a band of followers take over a nuclear missile silo. The FBI enlists the help of Sorenson s daughter Katherine, who is also a respected scientist, with the hope she can convince her father to surrender the missile silo. Katherine s research supports her father s thesis. She enlists the help of Paul, an FBI agent assigned to keep her under guard, in her quest to convince the scientific community of the imminent threat to the planet.