#screenwriting #filmmaking #writing #screenplay
Pretty much the same way you integrate many characters.
For example, you can group the villains, like in Lord of the Rings (2001) where Saruman's henchmen form an army.
For example, you can divide the villains into a hierarchy of antagonists and deal with each hierarchy in each act (the most potent last).
The thing to remember about antagonists and villains is that they are there to provoke, so you just need to manage all your villains in some sort of fashion so that they do that.
Read the 2000+ stage Hero's Journey/Transformation/New World, which you can purchase from http://www.clickok.co.uk/index4.html