Adventure Comics #494
Trying to prove Mon-El isn't actually Kryptonian, Superboy accidentally exposes him to lead, which both poisons him and returns his memory. He remembers that he is a space explorer from Daxam named Lar Gand, who visited Krypton, meeting Jor-El and Lara, before arriving on Earth. To save his life, Superboy sends Lar Gand into the Phantom Zone until he can cure him of his lead poisoning.
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Trying to prove Mon-El isn't actually Kryptonian, Superboy accidentally exposes him to lead, which both poisons him and returns his memory. He remembers that he is a space explorer from Daxam named Lar Gand, who visited Krypton, meeting Jor-El and Lara, before arriving on Earth. To save his life, Superboy sends Lar Gand into the Phantom Zone until he can cure him of his lead poisoning.
Plot details indexed by the Grand Comics Database (CC BY-SA).