Superman (1939-) #240

Under the Scarlet Jungle of Krypton lies a condemned device, with which scientist Mal-Va planned to send his assistant, Zol-Mar, into the past and then return him after ten minutes.

Written By:
Dennis O'Neil, Cary Bates
Curt Swan, Michael Kaluta
Dick Giordano, Michael Kaluta
Cover By:
Neal Adams