Fics like Teen Titans: Phoenix

Harry Potter and Sirius Black fall through the Veil, surviving via phoenix tears/basilisk venom fusion and absorbing a Horcrux's knowledge. Abducted by Psion researchers, both are given alien DNA — Harry becomes Kryptonian/Tamaranean, Sirius Martian/Czarnian. They escape alongside prisoner Koriand'r, claiming the suits built to weaponise them.

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