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The main story of the Resident Evil series is about deadly viruses created by corrupt corporations and bio-weapons turning people into monsters. It starts with the Umbrella Corporation secretly developing viruses for military use. In 1998, a virus outbreak destroys Raccoon City, creating zombies and mutants. Characters like Leon S. Kennedy, Jill Valentine, Chris Redfield, and Claire Redfield fight to survive and expose the conspiracies behind the outbreaks. As the series continues, different terrorist groups and corporations keep creating new viruses and parasites, leading to global bio-terror attacks. The games mix survival horror, action, puzzles, and monster fights while following the characters trying to stop these outbreaks and prevent human extinction.