Allison Georgia Doren was the doppelganger of Francie Calfo and an assassin who worked under the orders of Arvin Sloane and later Julian Sark. She is most noted for killing Francie in her own restaurant as well as Dixon's wife, Diane.
Allison made her first appearance inside of Francie's restaurant, receiving a call from Julian Sark. She then said that "Everything's in place." before hanging up. Suddenly, the camera panned into the kitchen and followed a blood trail on the wall...which led to the body of the real Francie Calfo, who had been shot in the forehead.
From there on out, Allison continued to pose as Francie Calfo while simultaneously taking orders from Sloane and Sark. Despite everything, she never raised any suspicion. However, when Sydney and Allison were at a cafe, Francie presented a gift to give to Michael even though she barely knew him. Sydney was wondering how Francie knew what kind of suit Vaughn would wear, but Allison managed to lie her way out of the accusation.
Her life with Sloane and Sark didn't cease, as she was ordered to perform a few tasks for the two of them. In one scene, Allison is seen standing next to a plumber holding a gun to his head shortly before she executes him. (why she was assigned this task is unknown). The second task was more serious however. After Marcus accidentally killed Sloane's wife during a raid on his villa, he ordered Allison to killed his wife, which she did via car bomb.
Allison was finally ordered to blow her cover and kill both Will and Sydney. Allison pinned Will onto the wall of the house and stabbed him in the chest, crying as she did so. She hid the body in the bathtub and waited for Sydney to come back home.
When she did, Sydney was getting more and more suspicious of "Francie" because Will wasn't home and she was too calm. She offered her coffee ice cream (which she accepted) and then ran into her room to get her gun. Allison showed up and said, "I just remembered...Francie doesn't like coffee ice cream." realizing she blew her cover. The two engaged in a fierce fist fight around the house, using any and everything they could find in order to subdue the other combatant. During the fight, Sydney found Will's body lying in the bathtub, thinking she had already killed him.
The fight reached its climax when Allison slammed Sydney into a mirror (possibly piercing her spine with a shard of glass) and Sydney fell to the floor, unable to fight any longer. Allison slowly reached for Sydney's gun, but Sydney slit her face with a large piece of glass and got the gun herself. She aimed the gun at Allison and shot her in the arm and chest twice, supposedly killing her.
But it was later revealed that she was revived...