A time machine is a perfectly good starting point. Add six timelines, a secret identity, and a third-act lecture on free will, and you might owe the audience a pencil. These 15 overcomplicated sci-fi movies let their big ideas get tangled in elaborate rules, cryptic dialogue, and twists that demand a second viewing before you’ve decided whether you enjoyed the first. Some are fascinating messes; others could have used someone in the writers’ room asking, “Wait, why?”
