The Cage Of Doom! Superman rides an empty rocket shell down out of the influence of the Green Kryptonite ring, and, with the help of a flexible lead-glass suit, lures the Anti-Superman Gang out of hiding and captures them The Face Behind The Lead Mask! This story is reprinted from Adventure Comics #300. When the powers of the Legionnaires go out of control, they summon Superboy to the 30th century to aid them. They discover the cause is a lead masked villain called Urthlo. When Urthlo drives back Superboy with Kryptonite vision, Superboy frees Mon-El from the Phantom Zone long enough for him to defeat Urthlo, who turns out to be a robot sent to the future by the teen-age Lex Luthor. But when the lead antidote (Serum XY-4) created for Mon-El proves to only be temporary, he is returned to the Phantom Zone to save his life. (12 pages)