Distributor U.S. Release
Tells the story of an unorthodox professor (Jared Harris) who uses controversial methods and leads his best students off the grid to take part in a dangerous experiment: to create a poltergeist. Based on the theory that paranormal activity is caused by human negative energy, the rogue scientists perform a series of tests on a young patient, pushing her to the edge of sanity. As frightening occurrences begin to take place with shocking and gruesome consequences, the group quickly realizes they have triggered a force more terrifying and evil than they ever could have imagined.
the official version from lionsgate.com on May 16, 2013
An unorthodox professor uses controversial methods and leads his best students off the grid to take part in a dangerous experiment: to create a poltergeist.
a modified formulation from screendaily.com on February 17, 2012