In incredibly intelligent, hugely muscular and physically brutal enemy? Unpossible sir!
Everyone knows muscles = stupid.
I think the average person likes the idea that extremely fit/strong/physically capable people are stupid, it makes them feel better about their physical inferiority.
In college, one of the smartest guys I knew, was a bber. His nickname was "Beast" from the Xmen, because he was huge and intelligent. Huge arms, chest, back, legs...but his mind was equal to his phyisque.
We know that there are intelligent "beautiful" people, but many assume that these people are stupid as well---because many people fawn at the feet of pretty people, so they use that to get ahead.
It's odd how the really, really smart people tend to be be of average or less than average looks, yet hate on those who are physically more attractive or muscular than them, but at the same time, wish that they either could be like them or with them.
And if you look at some of the people who draw the "handsome", "beautiful", "muscular", "curvy" characters---you see that they are their ideal man or woman---ones that they don't resemble.