Appolonia is the vengeful daughter of Don Frank Franchetti and Lauren Franchetti. She grew up with Jackie Estacado as an adopted brother and the two had a mutual hate-hate relationship. Appolonia grew up despising her father after she witnessed him torture and murder her mother's lover when she was a child. In addition to tramatizing Appolonia the incident was so traumatic for Lauren that she became comatose. It was at this time that she vowed to eventually take over the Franchetti family. Appolonia is in part responsible for the Angelus' return by agreeing to become the next host for the Angelus, but was unsuccessful when the entity chose her mother instead. Appolonia is later left in a coma soon after this failed attempt, but is quickly brought back to life with a fragment of the Spear of Destiny, the legendary weapon that is wielded by the Magdalena.
The spear fragment offered her two choices, a world filled with light or darkness. She chose the side of darkness hoping to team up with her mother in order to kill Jackie Estacado once and for all. However, things did not go as planned when Lauren gave herself completely to the Angelus entity and then forbid Appolonia from coming into contact with her again due to her new darkness based powers. After being banished by The Angelus, Appolonia mysteriously reappeared on the anniversary of her parents marriage. She seemed generally happy to see Jackie and was terrified of her mother, since there was nothing left of her in the Angelus.
Although Appolonia at first appeared to be in league with The Angelus when she set up Jackie, she ultimately betrayed The Angelus when she stabbed her with the spear of Destiny when the Angelus was about to kill the Magdalena and Jackie. This forced the Angelus entity to become disembodied once more, but it allowed her mothers suffering to finally end. Lauren died with tears of joy and was happy to see both Jackie and her daughter for the last time.
Appolonia's current whereabouts are unknown.