Supergirls Fortress of Solitude

Damon Brant was an archaeologist who accidentally discovered Supergirl's Fortress of Solitude. He learned her identity inside, and, after erasing his team's memories of the event, adopted her and blackmailed her into bringing him treasures. Luckily, an accidental beam of X-Ray Vision from Streaky the Supercat fried the part of his brain that had his recent memories. Supergirl then returned him to Midvale. ("Supergirl's Fortress of Solitude!")