John Krasinski and Natalie Portman on teaming up to play sibling adventurers in Guy Ritchie's action-adventure, Fountain of Youth.

On paper, Apple TV+’s Fountain of Youth seems like a fun idea: a mix of National Treasure and The Mummy with a bickering John Krasinski and Natalie Portman as brother-and-sister tomb raiders. That right there — the sibling connection instead of typical on-again/off-again partners in romance — is proof that at some point during this film’s gestation,