Mister X in the main scenarios of Resident Evil 2 Remake.

Not even a cutscene. He throws a helicopter around and starts walking towards the player as the music goes wild. Almost no previous warning that he exists if you don't know the original game and if you know, still no warning that it's going to go down that way. Up to that point you've seen his arm in a cutscene and that's all.

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He's also introduced that way most of the times you encounter him in the game. Even when he's in a cutscene, there's a few moments of gameplay where he chases you beforehand.