The Story: "Plague of the Galactic Jest-Master" by Denny O'Neil, Dick Dillin, and Joe Giella(listed as "wordmaster" and "picturemasters", respectively). We open on the giddly Jest-Master, and his plan to topple Thanagar!
Also on the way to Thanagar is Hawkman and the Atom, along with Jean Loring(tied up!), who has become mad. On the way they are stopped by some Thangarian police offers and attacked!
Turns out the Jest-Master has been infecting various people near Thanagar, and this eventually happens to Hawkman, and then Batman and Flash when the JLA come to help! It's the Atom that finally defeats the Jest-Master by confusing him with this size-changing abilities(there's a lot more to it than that, trust me).
Roll Call: Superman, Batman, Flash, Atom, Hawkman, Black Canary
Notable Moments: Nothing like this scene actually happens in the book. Still, makes for a really good cover, doesn't it?
Green Lantern and Green Arrow are on official leave as of this issue, as they start off on their "Hard-Travelin' Heroes" bit from Green Lantern/Green Arrow.
I bought this issue--and many from around this time--at a new comics store I found a few towns away. I was just this side of too young to have a driver's license, but once I got one I made many a trip to it, and gobbled up every affordable back issue of the book I could find. I ended up almost completing the run of the book thanks to this store--yay!
Update! A request was made to show the aforementioned "Jest-Master", so here you go!
...He doesn't quite live up to the name.