In the near future pets are cloned commercially. When you pet dies, you can get your “repet”. Even though it is forbidden, the company behind “repet” also clones humans and thus one day Adam Gibson (Arnold Schwarzenegger) comes home finding that he already is home.
For a large part of the film Schwarzenegger has to play the family man and he is not a good enough actor for such a part. When the cloning company sets out to kill either the clone or the original, the film evolves towards a genre that Schwarzenegger is more familiar with: action.
“The 6th Day” gives a few things to think about, but it is nothing more than a standard Hollywood action film.