Part 1 of 2. The search for the antidote continues as the deadly virus spreads throughout the city; and Fish Mooney, the Riddler and Penguin reveal plans of their own. In other events, Bruce meets Ra's Al Ghul and completes his last task in order to fulfill his destiny, but realizes he can't let go of his past; Gordon tries to win back Lee; and past alliances within Gotham City are broken and new alliances are formed.