The DC Comics universe took Las Vegas by storm on Tuesday.

Todd Phillips, who directed the hit “Hangover” movie trilogy, exclusively previewed the first trailer for his upcoming “Joker” movie to an audience attending the CinemaCon event, ahead of its official drop, Wednesday, April 3.

According to journalists present at the screening, the trailer shows Arthur – the Joker’s identity before he became known as superhero Batman’s arch-rival – in therapy. But when he is attacked in the street, the incident will change him forever.

Inspired by the “Batman: The Killing Joke” comic book by Alan Moore, Warner Bros described the movie a few months ago in a news release as “an exploration of a man disregarded by society [that] is not only a gritty character study, but also a broader cautionary tale.”

A movie poster was also unveiled, featuring Joaquin Phoenix as The Joker and bearing the message: “Put on a Happy Face.”

The movie is slated for Oct 4, 2019, release in US theatres.