Big Daddies are enemies in Bioshock and Bioshock 2.

Big Daddies are genetically enhanced humans that have been transformed into very large diving suits. They were originally named Protectors, as their main purpose is to protect Little Sisters as they harvest ADAM. The lights on their helmets can be used to determine their nature, as green means they're friendly, yellow means they are aware of their surroundings, and red means they are hostile.

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