Throughout their shared Marvel Comics history, Captain America and Wolverine have always had an unspoken bond of two fellow soldiers who served together in World War II. This is true in at least two universes across the wider multiverse, and in one of those realities, Captain America has a nickname for Wolverine that turned their brotherly bond into a weapon.
On both Earth-616 and Earth-1610 (main universe and Ultimate Universe), Wolverine and Captain America both fought in World War II, and in both universes, they did so before Wolverine was subjected to Weapon X. In the main continuity, Wolverine is slowly able to remember his life before Weapon X, learning that his name is James Howlett, and recollecting some of the events of his life prior to his mind-wiping torture. In the Ultimate Universe, however, Wolverine never regains those memories and the blank spaces in his life drives him crazy. So, when Captain America comes along– someone who knew Wolverine before he lost his memory–Cap uses that to his advantage when the two find themselves on opposite sides of a battle.
Related: Hulk’s Darkest Future Proves Wolverine Could Never Beat Him
In Ultimate War #4 by Mark Millar and Chris Bachalo, Magneto has declared war on humanity, and all of his crimes are being held over the X-Men’s heads as well just because they are somewhat affiliated with him. In response, the Ultimates are called into action to take the X-Men in until the situation can be resolved, only the mutant militant group doesn’t go down without a fight. In this issue, Wolverine is face-to-face with Captain America, and by doing something as seemingly trivial as calling Wolverine by the nickname of «Jim,» Cap gains a huge advantage over him.
Since Wolverine
Read more on screenrant.com