Small-screen sci-fi icons Karen Gillan (Doctor Who) and Katee Sackhoff (Battlestar Galactica) transition into the horror genre with Relativity Media's Oculus. Relativity Media has debuted the first trailer and poster for this upcoming thriller, which will change the way you look at an everyday household item, the mirror. The story centers on siblings Marie and Tim Russell (Karen Gillan and Brenton Thwaites) who are reunited after Tim's release from prison for murdering their parents (Katee Sackhoff and Rory Cochrane). However, Tim claims the deaths were caused by a supernatural force that resides within an antique mirror, as they try to uncover the truth behind what really happened that night. Take a look at this chilling footage, along with the one-sheet, before director Mike Flanagan's horror-thriller hits theaters on April 11.

<strong><em>Oculus</em></strong> Poster

Ten years ago, tragedy struck the Russell family, leaving the lives of teenage siblings Tim and Kaylie forever changed when Tim was convicted of the brutal murder of their parents. Now in his 20s, Tim is newly released from protective custody and only wants to move on with his life; but Kaylie, still haunted by that fateful night, is convinced her parents' deaths were caused by something else altogether: a malevolent supernatural force­­ unleashed through the Lasser Glass, an antique mirror in their childhood home. Determined to prove Tim's innocence, Kaylie tracks down the mirror, only to learn similar deaths have befallen previous owners over the past century. With the mysterious entity now back in their hands, Tim and Kaylie soon find their hold on reality shattered by terrifying hallucinations, and realize, too late, that their childhood nightmare is beginning again...