Chameleon Men Gang
From superman.nu: Supermanica
The Chameleon Men Gang
A criminal group in the 30th Century, "members of a chameleon race from another planet".
The Chameleon Men Gang imprison the Legion of Super-Heroes and replace them on Earth. Unable to duplicate the Legionnaires' powers, the disguised Gang members convince Supergirl they have lost their abilities and trick her into aiding them before exiling Supergirl and Whizzy into the Phantom Zone. Freed from the Zone with the aid of Whizzy, Supergirl traps the Gang under an impenetrable dome before rescuing the real Legion (Act No. 287/2, Apr 1962: "Supergirl's Greatest Challenge").
