Superman Supacomic #80
Superboy recalls a case when the Legionnaires were helped by a hero called Unknown Boy. It was only after Unknown Boy helped the Legion finish a case, that Superboy figured out that under the costume was Supergirl. Supergirl then recalled going through a red kryptonite cloud and losing her memory, but knowing she had to protect her secret identity, and so created the Unknown Boy costume.
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Superboy recalls a case when the Legionnaires were helped by a hero called Unknown Boy. It was only after Unknown Boy helped the Legion finish a case, that Superboy figured out that under the costume was Supergirl. Supergirl then recalled going through a red kryptonite cloud and losing her memory, but knowing she had to protect her secret identity, and so created the Unknown Boy costume.
Plot details indexed by the Grand Comics Database (CC BY-SA).