Pulse

When Josh Ockmann's computer is sold, it's discovered that his girlfriend Mattie (Kristen Bell) had been receiving strange online messages from him, which turn out to be a warning about an impending apocalypse. As Mattie delves deeper into the mystery, she teams up with Dex (Ian Somerhalder), who helps her uncover the truth behind Josh's cryptic messages and the forces that are using electronic devices to connect with the dead.