We got a peek at horror pic Oculus back in January and now Relativity has dropped the official trailer. Doctor Who‘s Karen Gillan and Brenton Thwaites star as siblings Kaylie and Tim, whose parents were killed 1o years ago in a brutal act blamed on Tim. When he’s released from custody, Kaylie sets out to prove a malevolent supernatural force was really behind their parents’ murder by returning to their childhood home. Katee Sackhoff and Rory Cochrane also star. Mike Flanagan directs from a screenplay he co-wrote with Jeff Howard, based on their short story. Oculus hits theaters on April 11.