“Past Imperfect”
The Time Trapper explains how he created the Pocket Universe. Superman and Superboy stop fighting and the Legion and Superboy take off in pursuit of the Time Trapper.
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Action Comics #591 (1938) is issue #591 of DC's Action Comics (1938–2011), with a cover date of August 1987. Written by John Byrne and drawn by John Byrne.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.