Now here's an interesting theme! I guess someone in DC editorial, wanting to give Superman a break for a month, realized that they had published approximately ten million UFO-themed stories, and all they needed, apparently, was an incredibly grim new cover by Joe Kubert.
Seriously--this scene looks like Hell on Earth. Maybe it's a good thing there isn't anything nearly as intense on the inside:
"Battle Between the Two Earths" by Gardner Fox, Carmine Infantino, and Murphy Anderson
"I Flew A Flying Saucer" by Otto Binder, Infantino, and Bernard Sachs
"Riddle of the Walking Robots" by Ed Herron, Infantino, and Joe Giella
"Genie in the Flying Saucer" by Fox, Gil Kane, and Bernard Sachs
"Warning from Another World" by Herron, Henry Sharp, and Giella
"Secret of the Flying Buzz Saw" by Fox and Russ Heath
"The Flying Saucers That Saved the World" by Binder, Sid Greene(penciling!), and Giella
"Earth Hero Number One" by Fox, Kane, and Anderson
"Earth is the Target" by John Broome, Greene, and Sachs
"The Flying Saucer Boomerang" by Binder and Infantino
"Flying Saucers Over Mars" by Joe Millard(?), Infantino, and Giella
...and everybody's favorite spaceman Adam Strange in "The Mechanical Masters of Rann!" by Fox, Infantino, and Anderson
There's also a small cover gallery, reprinting the covers of the two issues of Strange Adventures most of these stories are pulled from.
Hmm...maybe one story of UFOs setting people on fire would've been cool.