User blog comment:The Flaming Sword of Fury/TDI Analysis-The Good and The Bad/@comment-1764858-20141127061952/@comment-24152851-20141127141938

I mean a villain who is effective, but doesn't have it ridiculously easy to the point of unrealism. They're smart and skilled, but have a lot of competition and will be met with a lot of trouble along the way.

I'm actually a regular troper, and moderate the Total Drama trope pages. Yeah the trope your thinking of is "Dragon with an agenda" or "Disc One Final Boss". Where the dragon follows the main antagonist (or "Big Bad"), but has plans of their own. And when they turn on the Big Bad, the're like the final boss of the first disc, and the new antagonist replaces them.