The game also features many additional modes, secrets, and various endings over the original, as well as restoring the George Trevor sub-plot from the pre-release versions of the original game, while adding his daughter Lisa into the game as a transformed monster (and source of the G-virus). Other additions bring Umbrella researcher William Birkin and Alexia Ashford into the overall plot to make links between the games more clear and numerous. Shinji Mikami said that the remake is 70% different from the original.