XD12 Superhero System - Superpowered Roleplaying!

From the introduction: As you might expect, XD12SS uses 12-sided dice – a lot of them. Depending on how powerful the heroes and villains are in the game, you may need as many as a dozen 12-siders for each player and the referee. ... XD12SS is designed to simulate the characters and adventures found in superhero comic books, movies, and television series.