Subject Sigma



Subject Sigma (Symbol: Σ) is the protagonist of the Minerva's Den DLC BioShock 2. He has been revived by Charles Milton Porter and Brigid Tenenbaum, who sent out a distress call and who works with Sigma during the course of his adventure.

It is revealed that Sigma is Charles Milton Porter, who was previously jailed in Persephone due to Reed Wahl creating a fake audio recording of him so he would be accused of treason. Porter was then turned into an Alpha Series Big Daddy with no recollection of his previous life. His creation, The Thinker, found a way to revive Porter and helped him escape from Rapture by assuming Porter's personality as a familiar face to guide him.

Bugs/Glitches
In The Thinker level for Minerva's Den, the symbol for the Greek letter "sigma," visible on Subject Sigma's left hand, is replaced by the Greek letter "delta," belonging to Subject Delta (Xbox 360 confirmed).

Trivia

 * Although Jack and Subject Delta start off with finding Electro Bolt as their first plasmid, Subject Sigma's first Plasmid is Telekinesis, which is already equipped from the start of the game.
 * Sigma is the eighteenth letter in the Greek alphabet. This means that Sigma was the eighteenth test subject taken from Persephone for Alpha Series conversion. This may explain why he begins with the Telekinesis plasmid, as he is later in the series. Sigma is often used in Science and Mathematics to indicate summation of a set or series. This may explain why he begins with the Telekinesis plasmid, as he is later in the series.
 * Although part of the Alpha Series, and therefore supposed to be bonded to a single Little Sister, none is mentioned in the game.
 * A photograph in the ending video of Minerva's den shows the parts of Sigma's suit on the ground. Oddly, the boots are actually those of a Rosie, and not Alpha Series.