In this continuation of the original sci-fi detective series, THE BIG O, the people of Paradigm City still struggle with memory lapses after an unknown cataclysmic event 40 years ago. Negotiator Roger Smith defends Paradigm City against invading robots, but is plagued with questions about what kind of person he is. THE BIG O II promises new mysteries, old enemies, and revelations as to Paradigm City's mysterious past. In these episodes, a confused Roger wanders the streets and finds himself homeless. Roger's robot, known as The Big O, is vulnerable to attack when Roger decides to save his android love interest, Dorothy. Soon, Big Fau, a new Megadeus robot piloted by the city builder's son, Alex Rosewater, shows awe-inspiring weapons capabilities. When Big Fau spirals out of control and foreign Union spies are revealed, Roger realizes his past might be linked with Alex's. Roger, Dorothy, Norman, and the Big O find that they are up against a bigger threat than they imagined when they discover Paradigm City's enemies plan to destroy the city.