Alcatraz was a 'Bouncer' Big Daddy, the first successful 'Bouncer' to be experimented in 1961. He was supposed to be released in public and had a Little Sister assigned to him. However, the events of 'Bioshock' and Andrew Ryan, the man who masterminded this operation had set the 'Bouncer' eight years back, thus leading the People to think that the first 'Bouncer' is someone other than him. He was eventually forgotten by Rapture, and his endless slumber had almost rotted his suit and helmet.
1969. The year where Rapture turned into a post-apocalypse underwater city. Mysteriously, someone awaken Alcatraz through a Vita Chamber and placed him on a chair at the area where Big Daddy experiments took place. There, he woke up to find a Little Sister standing beside him.
That Sister was Elena Rose, 12 years of age.
Elena's biological father was responsible at turning her into a Little Sister, it was unknown how, or why he would do such a thing. Perhaps he was drunk or, he needed ADAM so bad and he couldn't find any of the unguarded Little Sisters. As A Little Sister herself, she would have to gather ADAM and find her Protector. It didn't matter which, either a Bouncer, a Rosie, a Rumbler or even an Alpha Series(though Subject Delta was the only known Alpha to adopt a Little Sister). As long as he is willing to protect her, it would be fine.
The search for her Protector went on until one day, Elena was skipping around Rapture when she noticed a lab where Big Daddy experiments were carried out. Regardless, she entered the lab with no fear or remorse, happily skipping around until she found an old Bouncer lying on the chair. The Big Daddy began to move suddenly as he woke up from his long slumber. Elena leaped with joy and smiled, finally found a Big Daddy to protect her.
"Are we gonna be together, Mr Bubbles?", she asked Alcatraz, her sweet smile spread across her face.
Alcatraz got off the chair and looked at her emotionlessly through his hemispherical helmet, he undid his detachable drill and scooped her up with his hands, much to her delight. She giggled playfully and reached out her hand.
"Let's be together forever, Mr B. We can get ADAM together and make you stronger like the other Daddies. Then you can be my new Daddy hehehe."
Alcatraz rumbled deep in his throat as if it was a response and placed her on his metal shoulders. Together they stepped out of the lab beginning their new lives in Rapture.
For some reason, Alcatraz and Elena were somehow similar to Delta and Eleanor Lamb. He can still think like a man, and he knew what's good and what's evil. He however, was a man who has mercy on anyone who begs for their life desperately when they are defeated. Elena, on the other hand, have the ability to gather ADAM as long as she can, despite that she still can be tired and sleepy. Like any Sisters, she will have to be sent to a vent whenever she needs to.
Alcatraz can still read and understand human language, it was Ryan who was behind this. He did something in the early procedures, something that kept his mind from being blank and corrupted, and to keep him having general knowledge on anything.
This 'Bouncer' was indeed…impressive, and a success to the 'Protector Program'. Alcatraz and Elena had formed a bond that was as strong as titanium, a bond which love never dies.