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"A foundation has to be built on something
"A foundation has to be built on something." ―Dru-Zod, Man of Steel
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The Assault on Arkham Asylum was a mission to extract the Joker from Arkham Asylum, which was successfully orchestrated by Joker's Gang.[2][3]


To be added


With some help from Harleen Quinzel, Joker's gang broke into Arkham Asylum with automatic weapons, firing on Arkham security and prisoners alike.[3] They freed Joker from his confines, then assisted him in capturing and torturing Dr. Quinzel with the same electroshock treatment she performed on Joker in the past.[2]


Aside from freeing Joker from Arkham, this is the event that most directly led to Dr. Quinzel becoming Harley Quinn and becoming Joker's partner in crime.[2]


  1. Suicide Squad and the A.R.G.U.S. website show that Harley Quinn was born in July 1990. Suicide Squad also shows that she was already with the Joker when Robin died. Zack Snyder stated, "In my mind, it was that Robin had died about 10 years earlier in some run-in with a young Joker". If Robin died 10 years before Batman v Superman: Dawn of Justice, which is in November 2015, that would place it around late 2005, when Harley was 15, and therefore put those scenes with Harley and Joker when she is 15 or younger. However, the absolute youngest Harley could be in those scenes is around 20, 18-19 at a real push. The Suicide Squad: Behind the Scenes with the Worst Heroes Ever book shows a rap sheet for Harley which gives her first crime as being committed on June 30, 2009 - a relatively smaller crime of assaulting a police officer. This has to be taken to be after she has met the Joker, meaning her time with the Joker has to have started in 2009, when Harley was 18. It absolutely cannot be any earlier. As her rap sheet details how her crimes escalated, in 2009 she goes no further than breaking and entering. However, in February 2010, she is convicted of kidnapping. By then, it can be taken that Harley has reached the point where she would have been an accomplice to Robin's death - perhaps with the kidnapping charge being to do with her part in the murder. So, the earliest Robin's death can really be is February 2010. This is placed as early as possible to as best as possible meet Snyder's comment, but it cannot be more than 5½ years to still fit with Suicide Squad.
  2. 2.0 2.1 2.2 Suicide Squad
  3. 3.0 3.1 Suicide Squad: The Official Movie Novelization