|Note; Colossus never wears this garb in the story.|
...in 2640, Plantaliens invade the Solar System, heading for Earth.
Meanwhile, Dr. Blitzmann claims to have perfected a growth hormone safe for humans and injects volunteer test subject Richard Zenith with it.
Unfortunately, Blitzman's lab assistant (and daughter) Eve mis-computed the dosage, making it 200 times stronger than planned.
Zenith grows to a height of over 2,000 feet, but the injection has also mentally-unbalanced him.
Proclaiming himself "Colossus", Zenith heads for Urbania, the capital of United Earth (as well as the Tri-Planetary Federation), to make himself the planet's ruler.
Meanwhile, the Plantalien fleet draws closer...
There was no second issue of Colossus Comics.
Pulp magazine company Sun Publications (whose titles included Golden Fleece Historical Adventures and 10-Story Book), abandoned their attempt at a comic book line after publishing this and one other title, Sun Fun Comiks.
Sun Publications went out of business two years later.
According to the blurb at the end of the story, Reinsberg (no first name known) and Bernie Wiest intended a sequel (where, presumably, Colossus would don the armor shown on the cover), but it's unknown as to whether the tale was ever drawn...or even scripted.