The new tagline for Gotham: Season 4 -- A Dark Knight -- is very fitting. The DC Comics-based series' Bruce Wayne is certainly transitioning into the Caped Crusader -- very quickly. The latest promotional video for Gotham offers a behind-the-scenes look at this major character development.

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"We see this last moment where Bruce takes on the responsibility of protecting the people of Gotham who can’t protect themselves,” Bruce Wayne actor David Mazouz said of the final moments of Season Three. “The importance, the significance of that moment -- of Bruce Wayne putting on a mask and stopping crime for the first time --

was chilling. Going into Season Four, Bruce Wayne is going to embrace that and really start to be a masked vigilante.”

Batman, as we all know, has a plethora of gadgets, an armored costume, and a robust vehicle. On the other hand, Bruce Wayne in Gotham has a leather suit. We imagine his transition into the hero we all know and love will be painful, but rewarding. He'll definitely meet his match when he trades blows with Scarecrow and Solomon Grundy in the upcoming season.

RELATED: Gotham: A Dark Knight Rises in Season 4 Promo Art

Returning Thursday, Sept. 21, on FOX, Gotham stars Ben McKenzie as James Gordon, Donal Logue as Harvey Bullock, David Mazouz as Bruce Wayne, Robin Lord Taylor as Penguin, Cameron Bicondova as Selina Kyle, Erin Richards as Barbara Kean and Sean Pertwee as Alfred Pennyworth.

(via Nerdist)