Gray Apocalypse

The human race is about to be destroyed by the Breeder Grays and replaced by millions of hybrids--half human, half alien--the Breeders have created. The weapon of destruction: an enormous asteroid the aliens have diverted to strike earth. Only Michael Kendon, a renegade assassin and sole survivor of a crushed resistance movement, can keep it from happening.

Kendon has only three days to locate a powerful weapon designed to deflect the asteroid, a gravity-beam device fueled by the same exotic...