AVClub: Synchronicity is more contraption than movie, its plot as mechanically functional as a clock, rotating characters around like gears. Low-rent but high concept, the film tackles that most joyously convoluted of science-fiction scenarios—time travel, of course—with lots of enthusiasm but not much originality. Writer-director Jacob Gentry, who made the middle third of the underrated exquisite-corpse horror film The Signal, appears to have boned up on his Heinlein and Bradbury and Carruth, the last of whose Primer remains a blueprint for any hungry young filmmaker looking to blow minds on a budget. But the ideas here, many of them just twists in disguise, are largely recycled. If you’ve seen one movie where multiple versions of the same person occupy the same timeline… well, you haven’t necessarily seen them all, but you have seen this one.