John Krasinski Didn’t Know Brother-in-Law Stanley Tucci Was His ‘Fountain of Youth’ Co-Star Until Midway Through Filming (2025)

John Krasinski is once again channeling his inner action star, following up Jack Ryan with Apple TV+ adventure flick Fountain of Youth.

The film follows Krasinski and Natalie Portman as estranged siblings who team up for a global heist to find the mythological Fountain of Youth. Adding to the family ties, Krasinski’s brother-in-law Stanley Tucci — who is married to Emily Blunt’s sister Felicity — also co-stars in the film, though that turned out to be a surprise to Krasinski himself.

“I didn’t even get to work with him, he was in scenes I wasn’t in,” Krasinski told The Hollywood Reporter at the movie’s New York premiere on Monday. “I didn’t even know he was in the movie until [director] Guy Ritchie said, ‘Yeah, Stanley’s gonna be in tomorrow,’ and I went, ‘For what?’ And he went, ‘This movie,’ and I went, ‘What?’ So that just goes to show you that they’re in love and they kept me out of it.”

Despite his experience with stunts, the movie also challenged him, as Krasinski recounted, “Running for a moving train is something that I haven’t done before and that was very real. And I love how Guy just sort of told me how it was going to go and he said, ‘You’re just going to run and jump on that train as it’s moving,’ and I went, ‘Yeah.’ And he just assumed I was going to do it, so that made me just do it.”

Along with Tucci, the star-studded cast also includes Eiza González,Domhnall Gleeson andArian Moayed. González echoed Krasinski’s experience with the action scenes, noting, “I had a lot of learning curves in this. I learned a lot of stick fighting, hand combat, muay thai; I really had to expand on different styles of fighting because every single location we really wanted to engage with the style and the visual stylistic sense of each city.”

Fountain of Youth starts streaming Friday on Apple TV+.

Neha Joy contributed to this report.