Published Jul 1970 by DC.
Cover pencils by Curt Swan, inks by Murphy Anderson. The Mystery Bombers!, script by Bob Haney, pencils by Curt Swan, inks by George Roussos; a pair of off-world slave programmers mimic earthlings and do a bombing raid in order to gain knowledge from Superman. Execution Planet!, script by Leo Dorfman, pencils by Curt Swan, inks by George Roussos; the Anti-Superman Gang capture Superman and take him to Execution Planet; story continues in Superman #229. 32 pgs. $0.15. Cover price $0.15.