Watch Outlast for Free: How to Stream the Movie Online at 123Movies. . A group of paranormal enthusiasts set out to investigate a haunted Castle on Halloween night. Excited to capture evidence of the afterlife, they quickly realize that the castle is even more active than anticipated. As the night wears on and the paranormal activity intensifies, the group must use all their knowledge and skill to outlast the supernatural forces and uncover the castle's dark history in order to escape with their lives.