The Atom
Plot line : A strange race of Beetle-Men from outer space (of unknow planet) riding
Beetle Men
a tiny meteor to Earth and set out to destroy all of the Earth's atomic pile in order to make the planet ripe for invasion. It's up to the Atom to save the planet from these buggy aliens!
The year: 1966 or 67 ?
Links
http://www.animatedsuperheroes.com/2008/09/invasion-of-beetle-men.html