The Famous Explorers of Space feature ran in all five issues of Space Squadron and the single issue of Space Worlds that used up material left homeless when Space Squadron was cancelled.
Written by Hank Chapman, and illustrated by Al Eadeh.
If the art style looks familiar, it's the work of Dan DeCarlo, who helped establish the iconic "look" of Archie Comics!
Dan actually started at Atlas Comics (the 1940s-50s predecessor to Marvel Comics) doing a variety of humor strips before beginning a long-term run on various Archie titles in 1951.
Even then, he continued to work for a number of other publishers, including Standard Comics, who asked him to create, write, and illustrate a teen-humor series.
(Every publisher had at least one of them!)
Exactly whose idea it was to set it in the "far future" of the early 21st Century is unknown, but the resultant strip, though extremely derivative of Archie, was unique in the teen-humor genre for it's Jetsons-style setting and "futuristic" slang.
It's the End of the World, and a scrappy bunch of freedom fighters battle alien invaders...
This is the conclusion of the mega-adaptation of Stephen King's mega-novel.