Lin has revealed that he has only asked former Terminator Arnold Schwarzenegger to return so far, but seems open to asking Vin Diesel to co-star as well. It is unknown what role Diesel would play if he should do the film. He might play a terminator or a resistance fighter. It is unlikely that Christian Bale or any of the other "Terminator Salvation" cast will return for the sequel but it is not impossible.
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