Ten years after a band of mercenaries first battled a vicious alien, the invisible creature from another world has returned to Earth — and this time, it’s drawn to the gang-ruled and ravaged city of Los Angeles. When it starts murdering drug dealers, detective-lieutenant Mike Harrigan and his police force set out to capture the creature, ignoring warnings from a mysterious government agent to stay away.

Mason Storm, a ‘go it alone’ cop, is gunned down at home. The intruders kill his wife, and think they’ve killed both Mason and his son too. Mason is secretly taken to a hospital where he spends several years in a coma. His son meanwhile is growing up thinking his father is dead. When Mason wakes up, everyone is in danger – himself, his son, his best friend, his nurse – but most of all those who arranged for his death