Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Writer credit by Martin O'Hearn; inker credit by Bob Hughes. Pencils previously credited to Sam Citron. Based on Martin O’Hearns blog:
http://martinohearn.blogspot.com/2014/04/millie-model-by-ken-bald-and-pe...,
http://martinohearn.blogspot.com/2014/03/pete-riss-mahunter.html, and
http://martinohearn.blogspot.com/2012/03/superman-riss-or-citron.html
and comparing this story to Citron’s known work on Classics Illustrated 10 [HRN 140] and the DC Mr. District Attorney series, this credit has been changed to Pete Riss.
Various intuders in the Fortress illustrated with details from Action Comics (DC, 1938 series) #241, World's Finest Comics (DC, 1941 series) #100, Superman's Pal, Jimmy Olsen (DC, 1954 series) #97, World's Finest Comics (DC, 1941 series) #164, and Superman's Girl Friend, Lois Lane (DC, 1958 series) #87.
Original inking credit of George Klein, as credited in this reprint, changed to match credits from Superman #148 index.
No villain.