At the start of the game the character in modern time entering the "Animus" would be taken over by the ancestor as the machine malfunctions. Throughout the game you'd be playing as both the modern character and the ancestor at the same time. The ancestor would have the most control over the body, wreaking havoc throughout the modern world. The modern day character would be fighting to take back control of their body, return to the Animus, then send the ancestor back to their time.

