Meet Katherine, the twin sister of Sam Winchester. No, she's not a long lost twin or anything.
She grew up the same way as her siblings had.
She, heartbreakingly, watched as her twin had walked off to try and have a normal life.
She was torn between following her brother and not wanting to disappoint her father, John.
So, after much debate, she chose to stick around with her father and her older brother, Dean.
What happens when Dean goes to take Sam on a trip to finding their dad?
Will Katherine happily greet her twin, or will she lash out on the one she never thought would leave her?