What's actually preventing Rocky from going the distance with Apollo Creed? Who's got his eye on the tiger? The Master of Disaster and the Southside Slugger may be the heavyweights standing between Rocky Balboa and greatness, but between him and them are the unsung villains of the Rocky saga -- the hurdles that hold him back from the headline fights. Stop hating on Ivan Drago and Clubber Lang -- they're small potatoes compared to these adversaries.

Rocky, Sylvester Stallone, 1976. © United Artists. Photo courtesy of the Everett Collection.