Sci-fi usually works best when it makes big ideas feel thrilling instead of homework, but some movies get so tangled in their own ambition that the fun starts to slip away. Plot twists pile up, timelines split, explanations multiply, and suddenly the audience is working harder than the characters. That does not always make these films bad, but it does make them harder to love on a first watch. These are the sci-fi movies that aimed for mind-blowing and ended up testing just how much confusion viewers were willing to tolerate.