Sep 11, 1992 CE
Harley Quinn Debuts in 'Batman: The Animated Series'
Harley Quinn first appears in the animated series episode 'Joker's Favor,' voiced by Arleen Sorkin. She quickly becomes a fan favorite. #DCAU #comics
Chronological Storyline (37 Milestones)
1993 CE
Harley Quinn Enters DC Comics - 'The Batman Adventures #12'
Harley Quinn makes her comic debut in 'The Batman Adventures' #12, adapted from the animated series. Her popularity leads to mainstream DC Universe inclusion. #comics #DC
1994 CE
Mad Love Origin Story - 'The Batman Adventures: Mad Love'
Paul Dini and Bruce Timm's 'Mad Love' graphic novel details Harley's origin: psychiatrist Harleen Quinzel falls for the Joker, aids his escapes, and becomes Harley Quinn. #comics #origin )
1997 CE
Harley Quinn Joins Secret Society of Super Villains
Harley becomes a member of the Secret Society of Super Villains in 'JLA' #11. This marks her rise as a recurring villain in the wider DC Universe. #comics #villain
1999 CE
Harley Quinn First Ongoing Series Launches
A 38-issue solo series 'Harley Quinn' begins, written by Karl Kesel and drawn by Terry Dodson. It explores her independent misadventures in New York. #comics #series )
2000 CE
Harley Quinn Becomes a Mother in 'Batman: Harley Quinn' #1
A storyline involves Harley adopting a baby she names 'Puddin'. However, the child is soon given up due to her unstable life. #comics #parenting
2003 CE
Harley Quinn Team-Up with Poison Ivy in 'Gotham City Sirens' Precursor
Harley and Ivy form a close friendship in various stories, laying groundwork for the Gotham City Sirens. #comics #teamup
2004 CE
Harley Quinn in 'Batman: The Animated Series' Finale
The series concludes with Harley appearing in multiple episodes, solidifying her role as a tragicomic antagonist. #DCAU #animation
By DC Entertainment - https://dcanimated.com/btas/btas-backstage/btas-backstage-press-kit/, Public domain, https://commons.wikimedia.org/w/index.php?curid=150289070
2006 CE
Harley Quinn Betrays Joker in 'Batman: No Man's Land' Tie-In
During 'No Man's Land', Harley begins to question her loyalty to the Joker, eventually helping Batman. #comics #storyarc
2007 CE
Harley Quinn's Origin Redefined in 'Batman: The Knight' Miniseries
A new origin story shows Harleen Quinzel's past as a gymnast and psychiatrist. #comics #origin
2009 CE
Gotham City Sirens Series Begins
The team of Harley Quinn, Poison Ivy, and Catwoman launches in 'Gotham City Sirens' #1, written by Paul Dini. #comics #team
Sep 1, 2011 CE
New 52 Reboot - Harley Quinn Redesigned in 'Suicide Squad' #1
Harley gets a new costume and backstory: she was a former psychiatrist who becomes Joker's accomplice and later a Suicide Squad member. #comics #reboot
2012 CE
Harley Quinn Kills Joker in 'Suicide Squad' #16?
In a controversial storyline, Harley kills the Joker, but it is later revealed to be a clone. #comics #drama )
2013 CE
Harley Quinn Gets Her Own New 52 Ongoing Series
A new 'Harley Quinn' series starts, written by Amanda Conner and Jimmy Palmiotti, emphasizing humor and anti-hero antics. #comics #series )
2014 CE
Harley Quinn Family Reunion Story Arc
Harley meets her long-lost family, including a sister named Delilah. #comics #family
2015 CE
Harley Quinn Appears in 'Batman v Superman: Dawn of Justice' Deleted Scene
Harley is mentioned and seen in a deleted scene, leading to fan anticipation of her live-action debut. #film #cameo
Aug 5, 2016 CE
Live-Action Debut in 'Suicide Squad' Movie
Margot Robbie plays Harley Quinn in 'Suicide Squad', introducing her to a global audience. The film shows her abusive relationship with the Joker. #film #DCEU )
2016 CE
Harley Quinn Becomes a Member of the 'Justice League of America'
In 'Justice League of America' #1 (Rebirth), Harley is recruited by Batman to be part of a new JLA team. #comics #team
2017 CE
Harley Quinn & Poison Ivy Romance Blossoms in 'Batman: The Wedding' Prelude
Harley and Ivy's romantic relationship becomes explicit in comics, marking a significant turn for LGBTQ+ representation. #comics #lgbt )
2017 CE
Harley Quinn Stars in Animated Film 'Batman: The Killing Joke'
Harley appears in the animated adaptation, voiced by Tara Strong. The film explores her role in the Joker's origin. #animation #film )
2018 CE
Harley Quinn Breaks Up with Joker in 'Harley Quinn' #43
Harley finally ends her toxic relationship with the Joker, declaring her independence. #comics #emancipation
2019 CE
Harley Quinn Gets Animated Series on DC Universe
The adult animated series 'Harley Quinn' premieres, starring Kaley Cuoco. It focuses on her life after breaking up with the Joker. #animation #series )
Feb 7, 2020 CE
Birds of Prey Movie Release
Margot Robbie returns as Harley in 'Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn)', a standalone adventure. #film #DCEU )
2020 CE
Harley Quinn Joins 'The Suicide Squad' (2021 Film) Cast Announced
Margot Robbie is confirmed for James Gunn's 'The Suicide Squad'. #film #DCEU )
2020 CE
Harley Quinn Marries Joker in 'Harley Quinn and Ivy' #3
In an alternate reality story, Harley and Joker marry, but it is not canon. #comics #elseworlds
Aug 6, 2021 CE
The Suicide Squad Movie Release - Harley Quinn Action Scene
Harley gets a standout scene in 'The Suicide Squad', including a colorful fight sequence. #film #DCEU )
2021 CE
Harley Quinn Stars in 'Batman: The Long Halloween' Animated Film
Harley appears in the two-part animated film, voiced by Tara Strong. #animation #film )
2021 CE
Harley Quinn and Poison Ivy Get Married in 'Harley Quinn' #75
In the comic 'Harley Quinn' #75, Harley and Ivy get married in a dream sequence, but later retconned. #comics #lgbt
2022 CE
Harley Quinn Animated Series Season 3 Premieres on HBO Max
The series moves to HBO Max and continues Harley's adventures with Ivy. #animation #series )
2022 CE
Harley Quinn Appears in 'Gotham Knights' Video Game
Harley is a boss in the 'Gotham Knights' video game, voiced by Kari Wahlgren. #videogames )
2022 CE
Harley Quinn Co-Stars in 'The Flash' Movie Cameo (Deleted Scene)
A deleted scene from 'The Flash' (2023) features Harley Quinn, played by Margot Robbie. #film #DCEU )
2023 CE
Harley Quinn Joins 'Suicide Squad: Kill the Justice League' Video Game
Harley is a playable character in the 'Suicide Squad: Kill the Justice League' video game, part of the Arkhamverse. #videogames
2023 CE
Harley Quinn 'Holiday Special' Animated Short
A holiday-themed episode of the animated series is released. #animation #special )
2024 CE
Harley Quinn's 30th Anniversary Celebrated with a New One-Shot Comic
DC releases a 30th-anniversary special comic for Harley Quinn, featuring multiple artists and writers. #comics #anniversary
2024 CE
Harley Quinn and Joker Return in 'Batman: The Adventures Continue' Season 3
Harley and Joker appear in the revival of the DCAU-inspired comic series. #comics #DCAU
2024 CE
Harley Quinn Animated Series Season 4 Announced
The series is renewed for a fourth season on HBO Max. #animation #series )
2025 CE
Harley Quinn Film 'Harley Quinn vs. The Joker' in Development
A reported film featuring Harley Quinn and the Joker is in early development at DC Studios. #film #DCEU
By Warner Bros. Discovery - Pentagram - Own work, Public domain, https://commons.wikimedia.org/w/index.php?curid=49534737