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The actor told ShortList that after meeting McG, he liked his idea of focusing on the birth of John Connor as the Resistance leader in the movie.
Bale said: "He had a strong desire to make a very different movie from anything that had been done before - I think to prove that to himself and others, he has a lot of fight in him.
"I mean, a guy who keeps on calling himself McG must have a lot of fight in him, you know? Not only did he want to reinvent the mythology, but he also wanted to reinvent himself."
Bale added that Arnold Schwarzenegger was "very excited with a healthy amount of scepticism" about the movie when the pair discussed it.
McG recently confirmed that he will not make another Charlie's Angels film and will instead focus on science fiction projects.
> Click here to watch three clips from Terminator Salvation
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