Arnold Schwarzenegger on Coming Back for 'Terminator Genisys'

To promote the 'Terminator' reboot, the veteran actor got into full costume to prank onlookers.
1:51 | 07/02/15

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Transcript for Arnold Schwarzenegger on Coming Back for 'Terminator Genisys'
Finally tonight, he's back. Arnold schwarzenegger wielding his famous catchfraphrase "I'll be back" in the fifth installment of the "Terminator" movies out today. He sat down with ABC's nick watt. Reporter: Wax work, arnie promoting the "Terminator" reboot. No wax work -- it's the man himself. I'm looking for sunglasses. Reporter: A prank for the charity website. I've been waiting for you. Reporter: And 31 years after the first terminator, arnie is back. Fighting his old self through cgi. He wins? I'm not telling you. I'll be back. I'll be back. I'll be back. I'll be back. I didn't want to ask you to say the line. But you've just said it. That's so nice of you. You've just said it now 38 times. He didn't want to ask that, unbelievable what an interviewer. Reporter: In this movie he's sent back in time to before the first installment. This is the beauty about a film that involves time travel is you can go back and change the entire premise. So long as you have rules that make sense and that you're within those rules. Reporter: Amelia Clark of "Game of thrones" fame plays badass Sarah conner. Come with me if you want to live! "Game of thrones" was a good introduction into this scale of movie. John sent me here to save you. Reporter: Jai Courtney is Kyle Reese. Why Australians? Inn why not? Popular with the ladies. Reporter: This has the same Janay Sa qua of the original and one of the same lines. I'll be back. What? Reporter: I'm nick watt for "Nightline" in Hollywood.

This transcript has been automatically generated and may not be 100% accurate.

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