Gary: And just what does this have to do with me?
Spottswoode: Our only hope is to have somebody act like a terrorist who wants to help them carry out the attack. An actor convincing enough to make the terrorists think he's one of them.
Gary: This is crazy. I'm an actor, not a spy.
Spottswoode: That's all spying is, acting. And they say you're the best.

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While flying, Spottswoode explains to Gary that they need his help to go undercover as a terrorist.

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