The Endless (2017)

As children, brothers Aaron and Justin escaped Camp Arcadia, a mysterious community they once knew. Years later, they receive a cryptic video from the camp, pulling them back to confront the past. While Aaron recalls the group as a friendly commune, Justin is convinced they narrowly escaped a UFO death cult. Upon their return, the camp’s members haven’t aged, and the brothers are drawn into strange, unexplainable events.