"Mento The Mighty" is a sort of supervillian from "pre-superhero" Marvel. Art is by Don Glut, this time uncredited. Stan Lee isn't mentioned, either. Originally published in 1960.
Reblogged from http://fourcolorshadows.blogspot.com/
The minature people on the second to last page remind me of ATTACK OF THE PUPPET PEOPLE, which was a fairly recently movie at that time. A dog figured in that movie and was featured in some of the advertising.