Issue: #27
The Flash faces a mystical serial killer who might be responsible for his mother’s murder!Notes:The Scribblenauts Unmasked Variant cover is a homage of the cover of Showcase #4.
First appearances: Keystone Killer
Creators: Harvey Richards, Matt Hollingsworth, Brian Cunningham, Pasqual Ferry, Jon Katz, Wil Moss, Carlos M. Mangual, Brian Buccellato, Patrick Zircher
Characters: Barry Allen, Patty Spivot, Henry Allen, Captain Frye, Tar Pit, Girder, Rainbow Raider, Keystone Killer, James Forrest, David Singh