The answer to the crossword clue "What arrives in the film Arrival" is most commonly "UFO," referring to the unidentified flying objects that arrive in the film. This answer has three letters and aligns with clues from recent crossword puzzles including The New York Times on August 7, 2025. Other potential related answers in crossword context include "ALIEN," but "UFO" is the most straightforward and fitting for this clue in crossword puzzles. So the primary answer is: UFO.
