The Joker: The Man Who Stopped Laughing (2022) #8

After getting hit by a train, the Joker awakens in the Gotham sewers, being cared for by...Solomon Grundy?!

While his mind and body are recovering, the Clown Prince of Crime and his new sidekick learn they're not the only monsters currently calling the sewers home! And the second Joker has set a course to find and destroy his alter ego...