The main characters usually manage to fight each other:
the Ultimates v. the Hulk;
Giant Man v. the Wasp;
Captain America v. Giant Man;
the Ultimates and European super soldiers v. Thor;
Iron Man v. the Black Widow.
However, there are also two major external threats:
the super-terrorists -
- and each raises a significant issue:
order v. freedom;
super power intervention provoking counter-aggression.