True Grit star Hailee Steinfeld has joined the OddLot Entertainment's sci-fi tentpole, Ender's Game.

The actress would play Petra Arkanian, the only girl in Salamander Army who quickly becomes Ender's ally and trusted right hand. Asa Butterfield has already signed on to play the title character, a gifted young gamer skilled in strategy and logistics who's recruited by the government to help battle an insect-like alien race. The studio is also search for its adult lead, Colonel Hyrum Graff, who trains the young male recruits at an elite military academy.

The film will start 70 years after a horrific alien war, an unusually gifted child is sent to an advanced military school in space to prepare for a future invasion.

Gavin Hood will be directing the film from a script he wrote, which is adapted from Orson Scott Card's award-winning novel.