"Sons of Anarchy" star Charlie Hunnam is headed to the Amazon. The beefy Brit will dust off his pith helmet to play Col. Percival Fawcett in "The Lost City of Z," based on the book by David Grann. Fawcett was a real-life British explorer who disappeared during his search for a lost city in the jungle that he'd dubbed "Z," which he'd hoped would turn out to be the mysterious city of El Dorado.

Hunnam is replacing Benedict Cumberbatch in the role of Fawcett. The "Sherlock" star will be busy with "Doctor Strange" and assorted projects, and although Cumberbatch is pretty magical, he hasn't yet figured out how to clone himself. Yet. In the meantime, he'll have to share the wealth.

Hunnam will be joined by Robert Pattinson and Sienna Miller, who co-star as Fawcett's assistant and wife, respectively. James Gray ("The Immigrant,""Two Lovers") will direct the adaptation. Shooting will begin this summer.

In the meantime, you can catch Charlie Hunnam in this fall in Guillermo del Toro's "Crimson Peak," which looks fantastic. Plus, it's never too late to watch "Sons of Anarchy," which ended in December.

[Via /Film,The Hollywood Reporter]