Prepare to #SeeYourEvil with actress Karen Gillan with the release of the official trailer for Relativity Media’s upcoming horror-thriller, ‘Oculus.’ The horror film, which is set to be released in theaters on April 11, also stars Brenton Thwaites, Rory Cochrane and Katee Sackhoff.

‘Oculus,’ which first premiered at the 2013 Toronto International Film Festival, was written and directed by ‘Absentia’ scribe and helmer, Mike Flanagan. Jeff Howard co-wrote the feature film’s screenplay with Flanagan, and the two based the story on the short screenplay the director penned with Jeff Seidman.

Relativity Media has released the following official synopsis for ‘Oculus’:

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.

For more information on ‘Oculus,’ visit the film’s official website, as well as it’s Facebook, Twitter and Tumblr pages. Watch the movie’s official trailer below.

Written by: Karen Benardello