NAMOR versus AQUAMAN
"The Showdown of the Century!"
Where: Marvel versus DC #2 When: March 1996
Writer: Peter David Artist: Dan Jurgens
The story so far...
Life in the DC and Marvel universes has always been tough, but when cosmic events conspire to endanger both, the heroes of both Earths face a secret crisis that could destroy them all.
Before time two cosmic entities existed, sexless brothers representing the two sides of all that is, was, and will ever be.
Turmoil between the two brought about an end to things as they once were, but in the aftermath their energies were dissipated into space, becoming part of the multi-verse.
Cosmic instabilities, as a result of the actions of various beings of different realities, created instabilities. After eons of recollecting their fragmented thoughts, the two brothers turned, and remembered their existence.
Now they pit their warriors against one and other.
Full Article: http://secretearths.blogspot.com/2006/03/namor-versus-aquaman-showdown-of.html