The Story: "Z--As in Zatanna--and Zero Hour!" by Gardner Fox, Mike Sekowsky, and Sid Greene. After enlisting the help of Hawkman, Green Lantern, the Atom, and the Elongated Man in their individual strips, Zatanna's search for her father ends here, with her coming to the entire(well, some of it) JLA for help.
Roll Call: Batman, Green Lantern, Atom, Hawkman
Notable Moments: Sekowksky and Greene's Zatanna is wonderfully sexy; about as sexy as 1967 DC comic could get away with. She's just adorable, so it's probably a good thing Green Arrow didn't appear in this issue.
The Elongated Man guest-stars, so this issue looks a little like a much one, just ten years early. After all, you've got two future members guest-starring in the same issue!
Zatara is resuced at the end, and while of course things were a little more innocent back then(in comics, at least) this final panel always seemed a little creepy to me:
It's not so much the dialogue, it's the addtion of the hand stroking the cheek, and the fact that Zatanna is one of the hottest babes in the JLA, who are all crammed in the background watching a little hesitantly.