Batman: The Killing Joke

Batman: The Killing Joke is the 2015 sequel to the 2013 film The Batman.

Plot
Batman faces the Red Hood in a chemical warehouse and knocks him into a vat of chemicals. Later, the Red Hood reappears as the Joker with his new moll, Harley Quinn. He murders a family of acrobats, leading Batman to take the sole survivor, Dick Grayson, under his wing as Robin.