The lovely girl came back to me... Wannabe actor Joon-cheol is living with his girlfriend who wants to get married. He tries to convince her to get married after he's made his debut but she breaks up with him in the end and kicks him out. Joon-cheol has nowhere to go but a friend of his has to go on a business trip and asks him to take care of his pet cat. However, what's waiting for him is not a cat but a girl with aphasia. Joon-cheol quarrels with his friend about calling the cops and comes out of the house. He goes back to his girlfriend but she doesn't accept him so he starts living with the cat girl.
A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.
When the White House (Secret Service Code: "Olympus") is captured by a terrorist mastermind and the President is kidnapped, disgraced former Presidential guard Mike Banning finds himself trapped within the building.
Life for former United Nations investigator Gerry Lane and his family seems content. Suddenly, the world is plagued by a mysterious infection turning whole human populations into rampaging mindless zombies.
When the crew of the Enterprise is called back home, they find an unstoppable force of terror from within their own organization has detonated the fleet and everything it stands for, leaving our world in a state of crisis.