The sequel to the 2019 film is set to be released in cinemas on the 4th October.
A first look trailer has been released of the new film, which will see Joaquin Phoenix (who won an Oscar for his performance in the first film)reprising his role as Arthur Fleck and Lady Gaga joining the cast as Dr Harleen Quinzel, a psychiatrist assigned to treat Fleck at Arkham Asylum who later becomes his accomplice Harley Quinn.
This sequel will feature plenty of music at the centre of it as highlighted by this teaser trailer and is directed by Todd Phillips, who directed The Hangover and War Dogs prior to Joker.
The cast is also set to see Zazie Beetz who will return from the first film, and will be joined by Brendan Gleeson, Catherine Keener, Ken Leung, and Steve Coogan.
Meanwhile, the title of the film refers to to a psychiatric syndrome in which a delusional state is shared by two people.
The film will be released by Warner Bros. Pictures.