Tom Cruise on What He Loves About Jack Reacher: 'He's Someone Who Sticks Up for People'

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Tom Cruise went back to Shanghai on Wednesday to promote Jack Reacher: Never Go Back, and he let fans know what makes the role so fulfilling for him to reprise.

"He's someone who sticks up for people who can't stick up for themselves," Cruise told the crowd during a Q&A session at No. 5 Studio in Shanghai. "You have the kind of physicality and the kind of humor and wit that's very unique."

WATCH: Tom Cruise on Reprising His 'Badass' Character in 'Jack Reacher: Never Go Back'

The second Jack Reacher film has the titular hero returning to action to help Susan Tuner (Cobie Smulders), the woman who took over the elite unit he once commanded.

The film definitely required more training than Smulders' role as Robin on the CBS sitcom How I Met Your Mother, but she was able to draw from unlikely life experience to help boost her performance.

"Raising children takes a certain amount of energy and patience, and I think I used a lot of that patience playing Susan Turner when dealing with Jack Reacher," Smulders revealed.

WATCH: Cobie Smulders Talks Working With Tom Cruise on 'Jack Reacher 2'

Of course, Cruise is no stranger to big-screen action sequences, but even he admitted to ratcheting up his normal routine for the film.

"For Jack Reacher, the fighting style is very different, so there's always a lot of training," he said.

Jack Reacher: Never Go Back opens Oct. 21.