That actually appeared earlier when the Legion was still in Adventure Comics. Brainy created it with the miracle machine (a gift from the Controllers) in the issue where the Dark Circle tried invading Earth.
Actually, what happened, MEM, is that Brainy finshed the clubhouse with the miracle machine.. and sent all the Circle Of Death baddies who'd invaded Earth back to their homeworld... Adventure Comics # 367.
Years later, Matter Eater Lad ated the miracle machine. It made him crazy, until an insane Brainiac 5 cured him.
