Justice League of America #220
In "The Doppelgänger Gambit," the Justice League of America confronts a shocking twist in the legacy of the Canary, as Earth-One's Johnny Thunder unveils the hidden past of the second Canary—her origins tied to Earth-Two and a desperate act by the Earth-One Superman to save her life. Written by Roy Thomas and illustrated by Chuck Patton, with inks by Romeo Tanghal and Marcos, this pivotal 1983 issue explores identity, memory, and the cost of heroism, all anchored by a powerful emotional core. The story's bold narrative is framed by George Pérez’s striking cover art, capturing the tension between the two versions of the character.
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Earth-One's Johnny Thunder reveals the origin behind the second Canary, placed in limbo by Earth-Two's Johnny Thunder at the Earth-One Superman's request following their battle vs. Aquarius, since Aquarius's radiation was killing her as she crossed to Earth-One after her husband's death. She was then replaced by her daughter, whose memory had been replaced with her's. The heroes defeat the Earth-One Thunder alongside the Earth-Two counterpart, while the revived JLA aid their JSA allies on Earth-One. The current Canary has her original memory restored and leaves with Superman back to Earth-One.
Plot details indexed by the Grand Comics Database (CC BY-SA).