Eviler Than Thou

When there is not one major villain, but TWO, and their plots often clash and intertwine. The two are usually drastically different, such as direct and violent vs clever schemer. They will also have vastly different moral/personal beliefs, which ensures that when they inevitably meet, they dislike each other. The heroes are caught in the middle and have to deal with the two different styles.

As the schemes begin to collide, the villains will look upon each other with disdain and disapproval, and even hatred. Despite t his, sometimes they will team up against the heroes, both intending to double-cross the other or turn the situation into their own benefit, or some other ulterior motive.

Sometimes one of them will begin a scheme so terrible that the other will be shocked and willingly work with the heroes to defeat the threat. If the threat is really, really bad (so bad that there's no way the terrible scheme villain could ever be considered anything BUT the major baddie after), either the scheming villain will die and the team-up villain becomes the primary antagonist, or the team-up villain becomes a good or neutral character and gives up his villainous ways, and the scheming guy remains the primary antagonist.

Samples:
• Magneto in X2, Stryker - after teaming up with the X-Men to defeat Stryker, Magneto seizes the opportunity to try to kill all the humans on earth using Stryker's plan. This is an example of a Terrible Scheme resulting in the team-up villain becoming the primary antagonist, at least for the remainder of the movie.
• In Beast Wars, Megatron and Tarantulas. Both have their own plots and distrust the other, but they do not outwardly fight, and they still fight together against the heroes. Megatron is more of a wiser, bigger-picture villain, while Tarantulas is more focused on personal gain/power.