As exciting as the cover for "Challenge of the Untouchable Aliens" appeared, it was always a good idea not to think too much about it. The alien, wearing some kind of Native American blanket as a loincloth, seems able to hold tight to The Flash and Aquaman, while Green Lantern's power beam, Wonder Woman's lasso and J'onn J'onzz's fist all pass through him harmlessly. So what do we think will happen when Green Arrow fires his arrow with The Atom as its passenger? It's likely it too will fly right through the alien's body, launching the Tiny Titan on a one-way ride. ("I shot The Atom into the air. He fell to Earth I know not where...")
Countless comic book stories had indoctrinated us readers about how important it was to keep a secret identity a secret, so this issue was a must-buy. Batman couldn't give up being Batman, so, obviously, it was Bruce Wayne who had to go!
It was probably the Flash's Rogues Gallery that kept me coming back. Rather than just committing crimes, Mirror Master, Captain Cold, The Top and the rest seemed to have vexing the Scarlet Speedster as their primary goal. This particular issue did not feature any of the costumed villains; instead we have an alien from another dimension who turns Flash into "The Heaviest Man Alive."
The second story was more character-driven, something editor Julie Schwartz liked to do from time to time. "The Farewell Appearance of Daphne Dean" brought back Barry Allen's childhood sweetheart, now with a crush of The Flash, but unaware that he and Barry are one and the same.
I was familiar with Tommy Tomorrow from his back-up appearances in Action Comics and later in issues of World's Finest, but I don't think I was a big fan of his adventures. I imagine it may have been the blurb on the cover heralding his "origin at the West Point of Space" that captured my attention and had me choosing it over the current issue of Aquaman or Detective Comics.
Alas, Tommy Tomorrow did not follow in the footsteps of many of his predecessors in Showcase, despite five appearances over a year and a half, and he disappeared into DC oblivion.
In fact, following his Showcase tryouts, Tommy did not reappear until fifteen years later in "Danger: Dinosaurs at Large" in DC Special #27.
That story was written by yours truly.