Part 2 of the Felix Faust plus The Lord of Time plus The Demons Three epic!
The story: "One Hour to Doomsday" by Gardner Fox, Mike Sekowsky, and Bernard Sachs. The JLA, having chased the Lord of Time into the future, try to go back by find themselves unable to return home.
They enlist the help of the Demons Three, who then try to turn the tables on them. Nice try, Abnegezar, Rath, and Ghast!
Roll Call: Superman, Batman Wonder Woman, Aquaman, Flash, Green Lantern, Martian Manhunter, Green Arrow
Notable Moments: The Demons Three are now colored pink, the look they will keep for the rest of the four-color career. To help defeat the demons, the JLAers "switch bodies", and its Batman who gets turned into Wonder Woman. Awkward...
A letter writer asks--nay, demands--that the Atom join the team. As a hint, they run another letter analyzing that each current JLA member's name has a sequential number of letters--i.e., Flash has five, Batman has six, Aquaman has seven, and so on. The response is that there is no hero with thirteen letters in their name, but there is one with four--The Atom!
By the way, that last, obsessively-compiled letter is by somebody named E.Nelson Bridwell!