Billie Jenkins's History
Billie Jenkins is a witch and the youngest daughter born to Carl and Helen Jenkins.
Besides the basic powers of a witch, such as spell casting, potion making, and scrying, Billie has the powers of Telekinesis and Projection. She is also one half of the "Ultimate Power". According to her mortal parents, her powers came from her maternal grandmother.
After the The Ultimate Battle where Billie vanquished her own long-lost sister, Christy Jenkins, Billie relocated to Los Angeles to start a new life.
Early life:
Billie was born to Carl and Helen Jenkins around 1986. As a child, she maintained a healthy relationship with her older sister, Christy. However, at the age of five, Billie witnessed her sister get brutally kidnapped by someone who would eventually be revealed to be a demon called Reinhardt. Since this event, her parents never spoke of Christy or the incident ever again, as they thought that it was what was best for Billie.
Billie's mother told her that she and her sister inherited magic from their grandmother. As a result of this, the Triad hired Reinhardt to kidnap Christy, knowing that the sisters would eventually grow to be powerful witches with a bond through magic and blood similar to the Charmed Ones, and set things in motion for the two sets of sister witches to stand against each other.
Meeting The Charmed Ones:
Billie found out that she was a witch when she noticed she was able to move objects with the flick of her hand. She eventually did more research on witchcraft and started scrying via a computer in order to find demons in San Francisco. While hunting demons, she dressed in a vinyl outfit in order to hide her appearance. One of her first demons lead her to a movie theater during the day, however unknown to her, she was subconsciously calling for her whitelighter who just happened to be Paige Matthews, a Charmed One. However, she and Paige didn't officially meet there. Billie scared off the demon and ran back out of the cinema, leaving an injured Paige. At her home, Billie takes off her black wig and weaponry and heads off to class.
When Black Heart lures a young man named Alastair into an alley and finds himself trapped in a dark tunnel and surrounded by Black Heart and Haas, Billie arrives only for the demon to get away. Billie later fights with Black Heart and Paige orbs in. Black Heart escapes and Billie blames Paige. They fight, but are evenly matched. Paige knocks off Billie's black wig and Billie leaves. Paige then finds an innocent whom Black Heart had been after. Haas suspects Paige is the one who chased Black Heart away. Paige attempted to scry for her, however she didn't get an exact reading. With the help of "Grams," Paige finally embraced the fact that even though she faked her death, she's still a whitelighter and she can't run away from that or her charge. Paige scries using Billie's wig. She orbs to Billie's room and talks to her while returning her wig. Paige wants to know what Billie knows about the disappearances. Billie says she is self-taught and tells Paige about the Alice-like names, and about how she scries for demons using a GPS unit and a computer. Later on, Billie enters the tunnel, but Paul Haas and Black Heart catch her and send her into the Alice-in-Wonderland world. She hears voices and sees bizarre and frightening images all around her. She finds herself in a courtroom and Haas and Black Heart menace her. Just then, Black Heart catches fire and explodes. Upon the illusion breaking, Billie finds Haas being confronted by Piper, Paige, and Phoebe. Haas now knows the Charmed Ones are alive, but the sisters throw potions and vanquish him. Billie then made a deal with the sisters; they would teach her everything they know about the craft and she would pick up the slack with battling evil, especially since at that time, the sisters were presumed dead by the world. Another condition of their terms was for Billie to discontinue wearing her black outfit.
Practicing Witchcraft:
The sisters let Billie stay in their home in order to help her become more skilled in witchcraft. Despite having many other things to deal with, from time to time Paige would assist Billie with potion-making and instruct her in fighting demons. The vast majority of the knowledge she came to have was acquired from Leo, whom Paige enlisted to help Billie learn the true definitions and origins of magic, though she also had a tendency to find things out for herself as well. Besides this, she also studied the Halliwell Book of Shadows and eventually created her own.
As the months went on, Billie became an increasingly powerful witch, proving herself to be a rare magical talent. Her mental based powers eventually expanded into a new active power, Projection: a supremely coveted and rare ability that enables the possessor to manipulate reality. However, it took her some time to adjust to this power, because of her ignorance of how to control it and use it properly. In fact, when she just only unknowingly developed this power, she actually turned her parents into assassins and nearly got herself killed in the process by them. However, with the help of the sisters, the Book of Shadows, and Leo, she became exceptionally skilled in her Craft and learned to thoroughly embrace her destiny of being a witch.
Finding Christy:
After discovering that Christy's kidnapping was supernatural and not otherwise, Billie became filled with vengeance and became unhealthily obsessed with finding the demons who took her and bringing her home. The sisters, by experience, knew that Billie's obsession would only lead to her getting hurt and not being able to bring Christy back at all though Billie didn't listen for the most part. Eventually, Billie honed her projection power to the point where she was able to project herself to Christy, finding her sister at last.
Turning Against The Charmed Ones:
Billie finally succeeded in finding Christy, but unbeknownst to her, during Christy's fifteen years in captivity, she was brainwashed to believe that the Charmed Ones were on the verge of becoming evil and was given the mission to "save" Billie and turn her against the sisters in order to kill them. However, it was much harder than she initially thought as Billie had become attached to the family. Christy started to plant doubt in Billie's mind, for example; trying to convince Billie that they should get an apartment together and move out of the manor, even jokingly telling Billie that Piper was torturing her with food; trying to get her to believe that it was way too selfish for the sisters to have faked their deaths, and that they were using them to get someone else to do their jobs and fight evil and convincing her that the sisters created Utopia with the Avatars for their own personal gain. The final straw for Billie came after her parents were murdered by the Noxon Demons who the sisters refused to vanquish because they needed information to find the "Ultimate Power" and get Leo back. Christy's plan ultimately worked and Billie eventually believed her sister, and moved out of the manor and back into her dorm room. It was eventually discovered that Billie and Christy's combined power of projecting and firestarting was the great power that the sisters needed to defeat.
Billie and Christy then set up base in Magic School. Although she still was unsure about the sisters' true intentions, Billie gave up on trusting them when Christy manipulated Billie into thinking Piper "attacked" her, however, it was not the way she made it seem. When she thought things couldn't get any worse, Christy mentions a spell that would allow Billie to project herself into the sisters' minds to find out what they're really thinking. Once in their dreams, she finds out that Piper is consumed with worrying if she will ever be able to get Leo back, Phoebe is consumed with her fear that it is too late to have the children she envisioned as well as Coop, while Paige is attempting to find balance and enlightenment.
The Ultimate Battle:
After turning Billie against the Charmed Ones, Christy brought her to Magic School, which at the time was taken over by demons. Once there, she met Dumain, a demon who she thought was an imaginary friend when she was younger, however he was working with Christy and The Triad to kill the sisters. Once she settled in, Dumain staged an elaborate plan to use incidents of the sister's past to convince both Billie and The Magical Community that the Charmed Ones had truly become selfish with their witchcraft, and Christy got Billie to take over the Manor thus leaving, Piper, Phoebe, and Paige to hide out in the Underworld and then eventually Phoebe's condo. Throughout her whole situation, despite being convinced that the sisters had become selfish, she was still reluctant to hurt them, and tried everything she could think of to keep from having to kill them. Even after accepting that she must, she admitted that she still didn't like it. The Triad suggests to Dumain that Billie and Christy summon the Hollow to kill the Charmed Ones, however two other demons were listening in on the conversation and they also happened to be working with the sisters. Summoning the Hollow takes a powerful force. Although the Charmed Ones were able to summon it themselves using The Power of Three, Piper and Leo's oldest son, as it would take "Charmed power" to summon it. Dumain shimmered to Victor Bennett's apartment where Wyatt and Chris were staying and convinced Wyatt that he was needed to help his mommy. Billie and Christy held hands with the young boy and combined their power with his in order to summon the Hollow. Once acquired, they stole Wyatt's powers so they'll be evenly matched with the Charmed Ones.
Billie and Christy faced off with the sisters who had also summoned the Hollow. During the battle, the manor was obliterated, additionally killing Christy, as well as Phoebe and Paige. Billie goes to Magic School and Dumain convinces her to use her projection power to send her back to Christy. However, she discovers that he's using her to go back to the Triad instead.
Billie projects herself back into the past at the Manor, just as the past Billie and Christy arrive. She warns them but past-Billie sends present-Billie flying into the wall with Telekinesis and goes on to fight. The battle starts to play out as before but then Piper arrives with Grams and her mother to cast a spell which drives the Hollow out of the five girls. Present-Billie and Piper merge with their past selves, time has caught up with itself. Billie and Christy then teleport out with a potion. Billie tries to convince Christy that they have been used by the Triad, but all Christy can think of is fulfilling her mission and killing the Charmed Ones. Billie then goes to the sisters for help and forgiveness. She projects back in time with the sisters to vanquish the Triad in the past and tries to convince Christy to stop her vendetta and come with her, though Christy hurls a fireball at her, causing Billie to telekinetically repel the fireball back at her in self-defense. Billie then breaks down and cries at her sister's death, as the sisters surround her.
Later life:
After the ultimate battle, Billie moved away from San Francisco to the city of Los Angeles to finish college, which she stopped attending after her parents' death. Eighteen months later, Paige asked Billie to look after Darryl Morris and his family in the East Coast due to all of the sisters' previous and current innocents and charges being murdered. Paige later comes to Billie to ask her to lend some of her magic to vanquish the Source, who recently came back as a Golem. After the Source was defeated, she presumably returned to Los Angeles.
When the sisters were battling an ancient demon named Gaxageal, Billie called Leo to check in on the sisters. Months later, Billie and Glynnis were asked to protect Tyler and his family from Prue. While guarding Kareem's house, they were knocked unconscious by a hooded member of the new Tribunal, who sought to use Tyler to gain more intel on Prue and the Old Ones. When Phoebe had a premonition of Prue coming after her husband, she tried calling Billie for help, though she was unable to answer.
About five to six years later, Billie moved back to San Francisco after finally finishing college. She eventually became like a surrogate aunt to Phoebe's daughters, babysitting the oldest two while Phoebe went into labor with her third and final child.