Journey Into Destiny

Long before it became Thor's title, Journey Into Mystery was a Marvel horror anthology like every other in the 1950s - your basic cross between Twilight Zone and Outer Limits. Towards the end though, it became a sort of Monster of the Month showcase, proudly proclaiming the creature's name on the cover.

Quiver at the sight of Zog! Fear as you meet Rro! Bombu will eat you! Watch out for Gruto! Roc! Glob! Korilla! And as I was perusing said covers, I found this:
Soooo... Marvel had the copyright a bit before the Green Goliath came to play. Interesting. And let's not forget the Hulk was actually gray on his first few appearances...
Ah, there we go. So it was an evolution. I'm kinda glad they didn't stick to the giant fuzzy Frankenstein's monster concept in the end...

BONUS MONSTER COVER... SHAGG!!!!!
It's all here. The secret origin of the sexual revolution. Read all about it. I indeed admit to being helpless before Shagg.