Jack

Jack is the protagonist of BioShock, whom the player controls throughout the game. He is a young Caucasian male and prior to (unwillingly) arriving in Rapture, he was a passenger on an airplane that crashed near the lighthouse that provided entry to the underwater city. During his journey through Rapture, he comes across a number of various gene altering substances, known as Plasmids, that he uses to empower and protect himself.

Shortly after the middle of the game, it is revealed that Jack is the illegitimate son of Andrew Ryan and Jasmine Jolene. This fact and other Audio Diaries explains how the Vita Chambers work on Jack and not splicers.

An Audio Diary By Jasmine Jolene, Ryan's mistress, and photos found on Ryan's desk indicate that Jack was purchased by Bridgette Tenenbaum on behalf of Frank Fontaine as an embryo. Andrew Ryan discovers this arrangement and proceeds to kill Jack's biological mother. Andrew Ryan's shoes and pipe are found at the scene, Jack can smoke his father's pipe with the same effects as cigarettes, this is the only pipe found in the game.

Jack was raised by scientists in Rapture who were responsible for his mental conditioning at the order of Frank Fontaine for the purpose of assassinating Andrew Ryan. According to Audio Diaries by Dr. Suchong, who was responsible for Jack's development, Jack had the physical body of a 19 year old at the age of one. Dr. Suchong also reveals in another Audio Diary that he is responsible for all of Jack's memories and the mind control imprinting that Frank Fontaine requested. Jack is sent to the surface as a sleeper agent living in his pre-programmed life until Frank Fontaine 'activates' him. Upon Fontaine's command, Jack boards a plane that passes over Rapture's entrance, then hijacks it, forcing its crash landing.

Jack eventually finds a cure for the conditioning with the help of Bridgette Tenenbaum, a chemical produced by Dr. Suchong called Lot 192. Jack completely frees himself from Fontaine's mind control. Once free, Fontaine challenges Jack to a showdown in Point Prometheus. In order to pursue Fontaine, Jack is forced to become a Big Daddy. Afterwards Jack confronts Fontaine and finally kills him with the aid of Little Sisters.