The Other Winchester
(This story starts at the end of Season 2 episode 21.) This is the story of Victoria Winchester, Sam Winchester's twin sister. Dean and Sam don't know that she exists. When she and Sam were born, the Yellow-Eyed demon came and took Victoria from her family. Now, 23 years later, Victoria, who now is a hunter and has been raised by two demons under Yellow Eyes' control, escapes. She travels to the Roadhouse, only to discover that Bobby and Dean are looking for Sam. She follows them and witnesses Sam's death, and return... Now, Victoria has decided to stick with her brothers, aiding them with their hunting and hoping to save Dean's life. This is where her story begins... This is a Sisterfic and later SPN/Doctor Who crossover.