In a future world where cloned plants, pets and human organs are freely available, the cloning of entire humans remains illegal. However, this is not enough to prevent an elite corporation from performing sinister cloning experiments along those lines, one of which involves decorated fighter pilot Adam Gibson (Arnold Schwarzenegger). When Gibson returns home one day to find his family infiltrated by a perfect replica of himself, he struggles to get his life back. But with a team of deadly assassins on his trail, desperate to erase all evidence of the illegal operation, how can Gibson hope to succeed?