Details of the plot for the forthcoming ‘Terminator Four’ have been revealed.

The fourth ‘Terminator’ movie, under the working title ‘Terminator Salvation: The Future Begins’ is in production and filming has started.

The film has a target release date of May 22, 2009.

The storyline is still speculative, but is believed to be set in 2018 and follows a group of nuclear holocaust survivors battling against their new robot masters, led by Bale as John Connor.

Sam Worthington stars as new character Marcus Wright, whose last memory is of being on Death Row. John must decide if Marcus has been sent from the future or saved from the past.

Rumours suggest that Arnold Schwarzenegger - who played the Terminator in the original film - may have signed to be the executive producer.

The rights to the ‘Terminator’ franchise were recently bought by The Halcyon Company who are reported to be keen to make at least three ‘Terminator’ films.

This guy is one bad Mother! I really like Christian Bale and think he’s one of the best actors of this generation.