Charlie Hunnam Steps Into "Lost City Of Z"

THR reports that Charlie Hunnam ("Pacific Rim," "Sons of Anarchy") will star in the adventure biopic drama The Lost City of Z. Hunnam replaces Sherlock and "Star Trek Into Darkness" star Benedict Cumberbatch, who was previously set to star but had to leave the project due to his commitments to the comic book based pic "Doctor Strange".

Based upon author David Grann's book--It follows British explorer Col. Percy Harrison Fawcett (Hunnam), who was attempting to find the so-called City of Z when he and his party disappeared in 1925. Over the next 70 years, different explorers tried and failed to retrace Fawcett's steps.

Robert Pattinson plays Henry Costin, a bored British corporal who answers Fawcett’s advertisement for a jungle adventure abroad. "G.I. Joe" and "American Sniper" co-star Sienna Miller will play Fawcett’s wife.

James Gray (We Own the Night) is set to direct the pic using his own adapted script.

The project has been in development for a while, with Brad Pitt set to star at one point . Now Brad will only produce the pic with Dede Gardner, Jeremy Kleiner and Anthony Katagas.