Sam met Billie while she was a Reaper. Billie tells Sam that she and the other Reapers hold him and Dean in disdain for killing their boss. She promises to make sure their next death is permanent and she'll banish them to The Empty.
Following her ascension as the new Death, Billie appears to have let go some of her hatred for the Winchesters now aware of their ultimate destiny.
Season 11 Edit
Billie meets Dean for the first time, after he went to see her in order to get into Hell and she tells him what she told Sam about their death. As Dean wanted to save Sam from Lucifer, he sung the password and Billie gave him a witchcatcher for Crowley, and sent him on his way.
She meets Dean again when he "dies" in order to speak with Billie. Billie takes her time savoring the moment, pleased to have the chance to reap Dean, but Dean offers his life in exchange for Sam's, knowing him to be the one to defeat the Darkness. Dean fails to provide Billie an answer as to how Sam is able to do this. Billie does not fulfill Dean's wish, stating that the answer will always be "no", and reveals that Sam is alive. Dean is, shortly after, revived, at which the disappointed Billie is forced to leave.
Billie caught sight of the Winchesters gathering up souls, she followed them out of curiosity. She learns of their plans, offering aid because the world is about to end.
Season 12 Edit
Billie appears outside of the house of dead hunter Asa Fox, where she finds Dean and tells him that something is killing hunters inside and she had already reaped a soul within. Billie is amused by Dean's efforts to get in and agrees to get him inside in exchange for him owing her one. Billie is able to throw Dean through the warded door and into the house.
The next morning, Billie appears and wants to collect on what Dean owes her. She wants to collect on a bigger prize: Mary Winchester. Sam and Dean tell their mother about Billie and she tells them she was a believer in that what was dead should stay dead and states that she can tell that Mary does not want to be alive and offers her mercy by taking her to Heaven. After Billie confirms that she can not kill Mary due to the rules, Mary declines and Billie tells the Winchesters that if any of them ever change their mind, to call her. Billie then disappears.
A desperate Dean calls Billie for help for escaping from Site 94. Billie makes a deal bound in blood with the Winchesters where she will kill them for a time and then bring them back to give them a chance to escape. In return, one Winchester must die for good at midnight. At midnight, Billie appears in the road, stops Mary's car, explains the deal and demands the Winchesters keep up their end of the deal. Mary offers herself up in her sons' place and goes to take her own life, but before she can, Castiel kills Billie from behind with an angel blade, stating that the world can not afford to lose any of the Winchesters.
Season 13 Edit
|“||So, you wanna die. I say, keep living.||”|
While on a case, Dean has to temporarily kill himself and encounters a Reaper, who he shrugs off and she reports back to her superiors after realizing his identity.
Dean's resurrection is halted by Billie who appeared as the new Death. She stops time after Sam's pleas annoy her, she explains to the confused Dean on how she was able to come back following her death, something that annoys Dean. She brings him back to her library, where she asked him about the recent rift. Dean agreed to tell her but only if she will allow the dead souls at the Meadows House to be able to move on. She shocked at his request but she agreed and he tells her that the rift was open because of Jack the son of Lucifer.
After remarking on his recent request and change in attitude, she realizes that he actually wants to die permanently. Dean confirmed this and ranted on about how he's failed several people and he just wants it all to end telling her she can reap his soul because he is done. Amused, she refuses and tells him about his possible deaths. Billie then tells Dean that she has seen how important he and his family are to the world and tells him to keep living before she resurrects him, stating he has work to do.
Afterwards, Dean tells Sam about what his recent experience and he was shocked to learn that Billie is still around.
It is revealed that Billie had Reapers monitor the Winchesters and their activities. It also revealed that she wants them to find the person who is killing the reapers and it turns out to be Rowena whose permanent death is said to be by the hands of Sam. When Rowena captures Sam, Billie appears and Sam sees her as the new Death. Sam watched as she talked Rowena down before Dean arrives with Jessica. Seeing him, Billie smiles and ominously said she’ll see him later.
Billie teleports Team Free Will back to the Bunker. She later appears to Dean and notes on Michael screaming in his mind. Dean notes that the latter is trapped but she is unsure. Dean brings up how she broke the rules to see if him and his family seemingly grateful for what she did. She casts it aside since Michael is a threat to the existence of the reality. She berates him for not listening to her warnings about dimension travel and tells Dean his books of his death have changed with Michael retaking control to destroy the world. Dean was shocked to hear this before Billie hands Dean the notebook containing the one fate where Michael loses, shocking Dean at what it reveals must be done. Billie tells Dean that its up to him what he will do with the information and departs, leaving Dean with the notebook.
The brothers learn that Billie resurrected Jack and had him hunt the Grigori while eating their hearts. The two are shocked to hear Billie wants Jack to get strong to kill God.
They are annoyed at Billie keeping Jack on a need-to-know basis about her plan, with Sam and Castiel expressing doubts about Billie's trustworthiness, Dean is more trusting given Billie's adherence to the rules. After she kills her servant for not obeying orders, Billie lectures them for risking everything on saving one girl while God is ending other worlds.
Soon Sam has had enough of her riddles and questions what the endgame is. Billie responds that as a reaper, she believed in the rules until Castiel killed her. After she got her new position, Billie inherited Death's knowledge and library containing books with the ultimate fates of everyone, including God. The Winchesters are shocked God has a book and Billie states that everything dies in the end the books write themselves rather than be written by God. To keep the world going, God had no choice but to build himself into the framework of it which is God's only weakness. Billie reassures them that not even God can read what's in his book unless she lets him. Billie reveals that Jack, Sam, and Dean are all in God's book and their destiny is to be the messengers of God's destruction. This revelation understandably shocked them.
Billie appears to the Winchesters again, explaining that the other Sam and Dean that they saw were fleeing from their universe after it was destroyed. She stated God is nearly done wiping the slate clean and tells them to find the Occultum.
- Besides Tessa and Jessica, Billie is one of the recurring Reapers to meet the Winchesters.
- Like the Winchesters, Billie has been resurrected.