Place this clip at the start of a reveal sequence, then follow it with a bass drop sound effect as the completed form takes its first step, and add a reload gun cue only if weapons appear in the next shot.
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This clip is Blackout's full transformation sequence, about twelve seconds of layered gears, hydraulics and folding metal as the helicopter reshapes into a robot. It feels massive, tense and intimidating, building mechanical power rather than a quick jump scare. It comes from the 2007 Transformers film.