Earlier this month, we brought you the news when award-winning actress Viola Davis (The Help) joined the cast of the long awaited big screen adaptation of the Orson Scott Card sci-fi novel Ender’s Game as a psychologist who oversees the children during training, and develops games to test their skills.

Now, Deadline reports that three more thespians have joined the cast.

Nonso Anozie (Conan the Barbarian, Game of Thrones), Stevie Ray Dallimore (Joyful Noise) and Andrea Powell (The Gates) are the latest additions, and will portray Sergeant Dap, Ender’s father John and Ender’s mother Theresa respectively.

About Ender’s Game:

Set in Earth’s future, the novel presents an imperiled humankind who have barely survived two conflicts with the Formics (an insectoid alien race also known as the “Buggers”). In preparation for an anticipated third invasion, an international fleet maintains a school to find and train future fleet commanders. The world’s most talented children, including the novel’s protagonist, Ender Wiggin, are taken at a very young age to a training center known as the Battle School. There, teachers train them in the arts of war through increasingly difficult games including ones undertaken in zero gravity in the Battle Room where Ender’s tactical genius is revealed.

Ender’s Game is slated to hit theaters on March 15th, 2013.