Simon Pegg has admitted that it is "terrifying" watching his Mission: Impossible co-star Tom Cruise doing his own "nail-biting" stunt scenes.

The 50-year-old actor,  who plays Benji Dunn in the popular action franchise, said "there's a real sense of genuine peril" watching Cruise.

Speaking to Conan O'Brien, Pegg said: "When you watch the movie and you see him do those stunts, and it's nail-biting and there's a real sense of genuine kind of peril because you know that it's him.

"But you know he survived because he was on Good Morning America that morning and he did some press.

"When we watch him do it, we have no idea if he's going to survive. So he takes a ride off a cliff, and everybody's just waiting for, 'Good canopy, good canopy, anybody?' It's terrifying."

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Pegg said 58-year-old Cruise "trains rigorously" to perfect his stunt scenes and admits the preparation that went into the upcoming Mission: Impossible 7 "are insane".

"He puts in a lot of work, he trains rigorously. He literally will become the best at, you tell him something and he'll just become the best at it. He'll take as many hours as it takes, but he won't do the stunt until he knows (it's safe).

"The prep that went into the big stunts for this film are insane."

Mission: Impossible 7 is tipped for release late next year.

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