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Jason Todd created by Gerry Conway & Don Newton in Batman #357 (March 1983)
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Jason was the second Robin, after Dick Grayson left to become Nightwing
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Originally the son of circus acrobats who were killed by a criminal, he was adopted by Bruce Wayne in the pre-Crisis continuity
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Post-Crisis, he was revamped to be an orphan attempting to steal the tires off the Batmobile
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Batman takes him in as protege to prevent him from becoming a criminal
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A Death in the Family – Jason is searching for his biological mother, but she's blackmailed by Joker to draw him out – Joker beats Jason and blows up the warehouse, and Jason dies
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Years later, revealed that when Superboy-Prime altered reality, it brought Jason back to life, although he suffered amnesia – Talia al Ghul takes him in and used a Lazarus Pit to restore his health, although it affected his mind
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Begins to plot his revenge on both Batman and the Joker – Joker for killing him, and Batman for not being able to save him
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Becomes Gotham crime lord known as the Red Hood – beats Joker within an inch of his life, but spares him to use against Batman
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Confronts Batman and wants to know why he never killed Joker – gives Bruce ultimatum: kill me, or I kill Joker – Bruce disarms Jason, and Joker escapes
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Becomes an anti-hero with no qualms about killing villains, and ends up in Arkham, where he kills dozens of inmates before escaping
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New 52 – revamped origin again, revealing that Joker was responsible for his parents' deaths – now he heads up the Outlaws, a group of anti-heroes looking for redemption
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Rebirth – once again Batman takes him in, but realizes he's too violent – he becomes Red Hood after his resurrection, which places him at odds with Bruce – creates new Outlaws group with Bizarro and Artemis