I feel that there is so much similarity between Climax of Star Wars Revenge of Sith and DoS's Julius mode. (apart from both releasing in 2005 and being very very cheesy)
Like, there was like this war between good and evil going on for ages, and it was thought to be finished just a bit ago.
We have this very cool young hero, who is a lovebird, wise and very strong bearded person, person which that the protagonist seems like he kinda hates this guy, and not-so-strong girlfriend heroine.
He just stroke the mastermind behind trapping the good guys in a some stronghold or something for his own reason, and another bad guy tricked the protagonist by telling that his girlfriend or wife is going to die.
Here the good guy is. He just killed the puppet villain. With tricks of the main villain, he believes that his girlfriend is dead (actually not, but he is very stressed and cant think of anything else than being angry). He turns evil, kills some bad guys and it's bearded person's job to kill him. So he does. But we know our now-evil protagonist will return.