Courtesy of Wikipedia:
The character Meranno first appears in the title
Invaders, and like hero
Namor the Sub-Mariner is a member of the
Atlantean race,
Homo mermanus. It is revealed in
flashback that Meranno despised Namor when they were children, and in adulthood allies himself with
Nazi Germany. Still consumed with hatred for Namor, the character reveals the location of the city of
Atlantis to the German forces, who destroy the Atlantean
fleet and place the then
Emperor Thakorr in a
coma. Thakorr is succeeded by Namor, who
banishes Meranno from Atlantis for
treason.
Meranno adopts the alias of
U-Man, and willingly submits to Nazi procedures that increase his size and strength.
U-Man reappears in the title
Invaders under the mental control of
Japanese spy Lady Lotus, and battles teen group the
Kid Commandos and the Invaders and joins the Nazi group
Super-Axis for a final confrontation with the superhero team. The
Super-Axis, consisting of former Invaders foes
Master Man;
U-Man; the original
Baron Blood and
Warrior Woman.
Here is the U-Man! Hope you like!
