The official announcement of the production of Batman: The Animated Series by Warner Bros. Animation, marking the beginning of development for the show.
The first episode of Batman: The Animated Series airs on Fox Kids, introducing audiences to a darker, stylistic version of Batman and his adventures.
The character Harley Quinn is introduced for the first time in the episode "Joker's Favor," marking the debut of a character who would become iconic in the Batman universe.
The series is released on VHS and later DVD, making it accessible to a wider audience beyond its television broadcast.
The final episode of Batman: The Animated Series airs, concluding the original series before it evolves into The New Batman Adventures.
The theatrical film Batman: Mask of the Phantasm is released, based on the animated series and featuring the same creative team and voice actors.
Bruce Wayne officially begins his crime-fighting career in Gotham City as Batman.
Batman faces his infamous adversary, The Joker, for the first time, establishing a long-standing rivalry.
Dr. Victor Fries develops a cryogenic suit to survive and seeks vengeance, becoming Mr. Freeze.
The Mad Hatter uses mind control technology to manipulate Gotham's citizens.
Dr. Harleen Quinzel transforms into Harley Quinn after falling for The Joker while working as his psychiatrist.
Matt Hagen discovers his clay-like transformation abilities, becoming Clayface.
Pamela Isley, aka Poison Ivy, executes her first attack to protect plant life.
Victor Zsasz starts his spree of serial killings throughout Gotham.
Killer Croc conducts a heist involving Gotham's waterways.
