The Robot Master
From superman.nu: Supermanica
A group alias employed by six members of the Legion of Super-Heroes: Brainiac 5, Chameleon Boy, Cosmic Boy, Lightning Lad, Saturn Girl and Sun Boy, in April 1962, when they play an elaborate hoax on Superman and Supergirl as a prelude to celebrating the anniversary of Supergirl's arrival on Earth (S No. 152/1: "The Robot Master!").
