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In the end, maybe Tagg got what he wanted all along... to be a part of the collection of super-villains he fantasized about.
Batman src

Mindslide is a super-villain with the ability to absorb knowledge with a touch. He is obsessed with superheroes and their adversaries.

Ronald Tagg worked at a museum dedicated to superheroes. After it was shut down, he went looking for other ways to appeal to his obsession. He found Doctor Death, but was caught in an explosion while visiting Helfern's lab. Tagg survived, having gained the ability to absorb people's memories and skills. After an altercation with Barbara Gordon, he broke into the Batcave. Afterwards, Ronald, under the alias "Mindslide," decided to attack the Flash Museum during its reopening.[1] He absorbed the powers and abilities of the Flash rogues and was able to dispatch Justice League Unlimited, who Batman had called earlier. He was then confronted by The Flash. She quickly surrendered and gave him access to her brain, which psychically allowed the other members of the Flash Family to knock him out. Sent into a coma, and Batman brought Tagg back to the Batcave.[2]

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Flash Villain(s)
This character, team, or organization, has been primarily an enemy of any or all of the various incarnations of the Flash. This template will categorize articles that include it into the category "Flash Villains."

Justice League Villain

This character has been primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."