Not technically a monster, Lincoln's homage to Star Trek "Mr. Rock" is often lumped in the category. This above carded example is missing his ray gun and space communicator. Given with his budget nature, Mr Rock's gun looks like a GI Joe Flare Gun and his "Space communicator" looks like a transister radio that would come with a barbie clone, it's even pink!
There are no known packaging variations for Mr. Rock and he's considered a very tough figure to find. Carded examples usually fetch thousands when they surface.
There are colour versions of Mr Rock's sweater, the one on the left is textured material while on the right is smoother and closer to a Mego Star Trek figure. I have no idea which figure came first and are equally rare at this point.
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The Mego Museum Forum has a section devoted to toys like AHI where sellers can discuss, buy, sell and trade. It's the biggest message board for such things in the world and it's the offical message board for Plaid Stallions.