The Sirens get back together after a brief breakup and will become a formidable force in Gotham.

Penguin tries to take control of the situation regarding Professor Pyg, but is he successful?

Jim and Harvey have a disagreement about how to proceed with Professor Pyg.

Gordon and Bullock head into the Narrows to investigate on Gotham. "A Dark Knight: A Day in the Narrows" is the seventh episode of the show's fourth season.