Karl Urban ("Doom," "The Lord of the Rings") will lead the cast of the $25 million 3D action feature "Relentless" for Baldwin Entertainment and Velvet Octopus reports Variety.

Demian Lichtenstein ("3000 Miles to Graceland") will direct the story of four extreme sports professionals who survive a plane crash in the Amazon jungle, and must use all their survival instincts as they are hunted by a group of homicidal natives.

Lichtenstein was mentored by James Cameron on the set of his upcoming 3D epic "Avatar", and is being trained in other 3-D techniques by James Mainard and Phil McNally of DreamWorks.

Shooting kicks off this September in Puerto Rico.