"The Endless" is a low budget fantasy thriller that does a great job of capturing attention from the start. Two brothers return to the cult they "escaped" from ten years earlier to...well, it's not really all that clear why they returned, other than maybe the real world wasn't being all that nice to them. This is the whole problem with the film. Lots of creepy, strange and ominous things occur, but ultimately none of it is tied together in a meaningful way. The viewers are left with very little to grasp and the result is a film you quickly forget within minutes of the ending.