Once again, Superman and Hawkman get the lion's share of the cover. Hmm...
The story: "Enemy From the Timeless World!" by Gardner Fox, Mike Sekowsky, and Bernard Sachs. Some of the JLA are unable to get into the Secret Sanctuary because a strange barrier is blocking the entrance!
That barrier was made by a man from the future, who puts the remaining JLAers through a series of death-traps to test them. When they succeed in beating the traps, they are told that a group of future men have gone into the past to have them fight the Alien-Ator, who is trying to take them over!
Roll Call: Superman, Batman, Wonder Woman, Aquaman, Flash, Green Lantern, Martian Manhunter, Green Arrow, Atom, Hawkman
Notable Moments: I've only explained about a third of this issue's plot, I bet Fox and Schwartz needed a flow chart to follow it all.
As I've said before, Sekowsky drew great aliens. It must have been tough coming up with new designs for the approximately fifteen-hundred new alien races Fox came up with during their run.