Alpha Series (Big Daddy)

"The Big Daddies are now in their Alpha Series. They seem that they try to attack me, but if I strike at them first, I'm always ready to do it so to kick my butt. I must defend myself from them. The Preschool Girls, Booker, and I, are ready for a combat against them. If it is a fight what they want, we'll be ready for them."

--Su Ji-Hoon, Alpha Series

The Alpha Series, a type of Big Daddy, was the first line of protectors to be bonded to Little Sisters. They are introduced in BioShock 2, and in a When the Cold Breeze Blows Away chapter, Alpha Series, as a new type of enemy.