Rapper Common will have a starring role in the upcoming fourth instalment of the Terminator series, Terminator Salvation: The Future Begins.

The Chicago MC will play a freedom fighter named Barnes who is defending the human race against a machine that aims to destroy it.

Common will star alongside Christian Bale — who will play the main character, John Connor — and Sam Worthington, among others.

The Warner Bros. and Sony-distributed film is set to hit theatres in May 2009.