THE X-MEN versus THE BROTHERHOOD OF EVIL MUTANTS & NAMOR
The Sub-Mariner joins the Evil Mutants (Marvel comics)
Where: X-Men #6 When: July 1964
Why: Stan Lee How: Jack Kirby
The story so far...
Once friends, two of the Earth's most powerful natural forces - Professor Charles Xavier, and the man called Magneto - become bitter enemies as they are divided by philosophy.
Forming their own mutant factions, each pledged to their own ideals of a better world for mutantkind, they come to blows as rivals.
In these formative days, both Xavier and Magneto consider the possibility that the legendary war hero - the Sub-Mariner - may in fact be a mutant, and thus begins a race to pledge the mighty warrior to each other's cause. Will the stubborn ruler succumb to Magneto's deception, or recognise the righteous path of Xavier? Stay tuned!
Full Article: http://secretearths.blogspot.com/2006/11/x-men-versus-brotherhood-of-evil.html