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.

History
The Alpha Series were a failed line of prototype Protectors developed first by Dr. Yi Suchong. The line was completed by Dr. Alexander using prisoners from Persephone Penal Colony as test subjects. Each member of the Alpha Series began as a test subject for various Fontaine Futuristics Plasmids, and they retain some Plasmid abilities as a result. The bodies of the Alpha Series were less drastically modified than the later models when placed inside their suits. Functioning Alpha Series such as Subject Delta were still heavily spliced, granting them greater strength and stature than most citizens.