Boss battles are common in gaming. Nearly every story driven game has them, and they often serve as a climax for (certain parts of) the game. They are also integral to the Metal Gear Solid games, which feature some of the most unique, memorable and intense fights gaming has to offer. But what are the most outstanding boss battles in the franchise? Of course, with the countless enemies the player fought over the years, there are many more boss battles to consider, but here are five of the best.