Superman #222

When a mysterious stranger named Halk Kar crash-lands on Earth, Superman is stunned to find a note in Jor-El’s handwriting that suggests Halk might be his long-lost brother. As the two team up to stop the villain Wrecker Ross, Halk’s sudden memory of a shocking electric shock reveals a truth far stranger than blood — he’s not from Krypton, but a traveler from Thoron who once met Jor-El in the final days before Krypton’s destruction.

In "The Sweetheart Superman Forgot!", a mysterious red kryptonite strips Superman of his powers and his memories, leaving him to start anew as Jim White on a quiet farm. There, he finds unexpected warmth in the company of Sally Selwyn, her father Digby, and even a surprising connection with Lori Lemaris—though Bart Benson, jealous of Jim’s growing bond with Sally, schemes to drive him away. When Jim is nearly lost to the river, rescued by Aquaman and Lori, Superman awakens with his powers restored—but the love and life he lived as Jim White remain a mystery he can’t recall.