Jack

The product of a Cerberus experiment to enhance human biotic ability, Jack (designated "Subject Zero" by Cerberus) carries a hostile personality that is the result of the torture and captivity she endured while she was imprisoned at a remote Cerberus outpost during her childhood. She later escaped and became involved in crime, murder, and religious cults, all in an attempt to find some meaning for the horrible treatment she was forced to endure.

Jack's loyalty quest involves her finding some closure from her past; she asks Shepard to take her to the facility where she was raised and blow it up. Shepard and Jack travel to the abandoned facility, disrupt mercenary activity there, and destroy the facility. If both Jack and Miranda's loyalty missions have been completed, a fight ensues between Jack and Miranda, which Shepard must quell. If the player has a high enough Paragon or Renegade score, he/she can stop the fight. The later in the game that the fight occurs, the more likely it can be resolved in a neutral manner. Otherwise, he/she is forced to side with either Jack or Miranda, causing the other to lose her loyalty to Shepard unless he/she later speaks with her and passes a difficult Charm/Intimidate check.

Jack is available as a romantic option for male Shepard and can be approached two ways: either a one-night stand that leaves her distrustful of Shepard, or slowly gaining her trust, revealing a more vulnerable side to her personality.

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