What if Dr. Doom led the Avengers?
Basically, the story takes place imediately after the storyline where The Avengers detatched from the U.S. government and became a U.N. sanctioned task force, much to the U.S. defense department's chagrin. However, in this version of things, Dr. Doom takes advantage of the situation and, using his influence in the U.N., makes himself a member of the team. The story then shows how the team changes over the next few years, with Doom gaining more and more influence over his teammates and more and more influence over the team's roster changes. Ultimately, The Avengers roster is:
Dr. Doom
USAgent
Ares
The Hulk
Taskmaster
Moondragon
The Punisher
Quicksilver
Mystique
Cardiac
As the years pass in the story, we see the team, under Doom's influence, take on morals that are more akin to Wildstorm's Authority. It the climax, Doom initiates a plan to "save the world" by turning on the U.N. and having The Avengers take control of the world for themselves. The former members of The Avengers then have to battle against the new team for the sake of the planet.