Sunday's episode of Running Wild with Bear Grylls: The Challenge featured Doctor Strange and Sherlock icon Benedict Cumberbatch climbing sea cliffs and surviving freezing waterfalls in Scotland.
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The 46-year-old actor explained he agreed to appear on the show because he wanted to learn more about resilience.
"I'm feeling a little bit of communion with my grandfather," he added. "I wish he was around. He would have been under the water, rather than on the water, but, yeah, there's definitely a theme playing itself out here."
His late grandfather Henry was a submarine officer in both world wars.