On-sale date from a promotional house advertisement in Superman's Girl Friend, Lois Lane (DC, 1958 series) #45 (November 1963) and copyright registration.
Letters from Rusty Schireson, Gary Heeter, Mary Wintrol, Louis Lopez, and Charles Silbergleith. Reader suggestions for new Legionnaires include Gas Girl.
Alaktor switches Hitler's, Nero's, and Dillinger's minds with Superboy's, Mon-El's, and Ultra-Boy's. Saturn Girl tricks them into defeating each other, and the Legion forces Alaktor to undo the process.