During the game, you play as the CIS, the Republic, the Empire, or the Rebel Alliance, and lead each faction in the key battles of the Republic age, and the Empire age that each seperate faction fought in.
Desmond Miles is trained to become a modern-day Assassin through the resurrected memories of ancestor Ezio Auditore da Firenze, who uncovers a massive Templar conspiracy in Renaissance Italy leading to the new Pope.
Ezio travels to Constantinople, at the peak of the Ottoman Empire to discover the truth behind his Ancestor, Altair, which will help him retrieve a powerful weapon hidden within Masyaf, the ancient assassins' fortress.
The Call of Duty series returns this time into a modern day setting. The player takes control of a character nicknamed "Soap," for the majority of the campaign and will need to progress through many modern warfare scenarios.
The game spans the stories of the four films (The Curse of the Black Pearl, Dead Man's Chest, At World's End, On Stranger Tides). It features over 70 characters from the franchise and various locations.