So, I have two game ideas. Both are for a very small group of two or three people. Both are using the Legend system (by ruleofcool, not Mongoose Publishing).
The first is a Star Wars game. You might know the story, a bit. A jedi and his padawan (possibly a third character appearing at some point) must go to a planet to negotiate a peaceful resolution of the Trade Federation blockading a peaceful planet. Not everything goes as planned, however, and things quickly escalate. Recognize the story? It's Episode 1, but with a twist of the players replacing the three main cast and deciding how action flows.
The second is a tale of revenge. Twelve heroes are chosen to go and stop a great and terrible evil. Three betray the other nine, and are killed for their treachery. The nine complete their task and are hailed as heroes, returning to the empire and gaining great glory and power. Twenty years later, the nine heroes have become corrupt, ruling their lands in whatever way they see fit.
Except that's not the truth. The three were the ones to complete their task, and were cut down by the nine. Everything taken from them, there is only one overarching goal for the three; vengeance.
If you've read Ubel Blatt, this is very much based on that. You don't have to be one of the betrayed, but having a reason to want to kill the heroes or otherwise change the empire is very much needed.