An assassin incarnation of Will Smith faces off against a younger clone of himself in the upcoming flick Gemini Man.

The main problem that he faces is that this clone thinks just like him, so it knows his every move before he even makes it. Ruh-roh!

The film is directed by Ang Lee, and co-penned by Game of Thrones writer David Benioff and The Truman Show‘s Andrew Niccol (with others).

Will Smith obviously stars – twice, we guess – alongside Mary Elizabeth Winstead, Clive Owen and Benedict Wong.

The video below offers a look behind the scenes at the making of the film, including the quite incredible effects to bring us two differently aged incarnations of Will Smith.

Gemini Man is set to appear in Australian cinemas from October 10.