Jimmy and the Newsboys continue their investigation of strange beings in Scotland, including a great two-page spread of various beasts, and the introduction of one of my favourites, Angry Charlie.
Their investigation eventually leads them to the Evil Factory, and battles with sea beasts and dinosaurs, and where Jimmy is experimented on and reverted to a powerful pre-historic form. Meanwhile, back in Metropolis, Superman pursues the San Diego Five String Mob, only to see them escape in a Boom Tube. We never do find out what all that was about. The Superman scene this time seems like an afterthought, kind of a "have to have Superman in here somewhere" scene.
Colletta inks the 24-page story, with Murphy Anderson doing the usual touch-ups. Anderson inks the full cover. An alternate cover for this issue was inked by Steve Rude for the cover of the first of the current JIMMY OLSEN reprint tradepaperbacks.
Back-up this issue is the cover and lead story from STAR-SPANGLED COMICS #11, the fifth Newsboy Legion story from 1942, "Paradise Prison", a 13-page adventure which sees the kids, after hearing claims of brutal treatment at a reform school (where they themselves could have been sent if not for the good word put in for them by Jim Harper), have themselves sent up. The warden, Mr. Goodley, puts up a fake front of running a comfortable reform school so the kids don't inform the Guardian, but they're able to see through his ruse.
Also of note, this issue has a full page ad to order the first issues of IN THE DAYS OF THE MOB and SPIRIT WORLD, which mentions Kirby prominently. It claims the books sold out quickly and they've "gone back to press with a special run", but I suspect that's not true and these were copies returned or maybe never even distributed.