Batman: Arkham Knight – GCPD Lockdown is a DLC released in October 2015. Set after the events of the main game, players control Nightwing as he works to prevent the Penguin from escaping the Gotham City Police Department. The DLC focuses on combat and stealth, with Nightwing using his acrobatic fighting style and gadgets to defeat Penguin’s gang. The mission highlights Nightwing’s role in maintaining order in Gotham while Batman is absent.