Everything that happened to Klaus in the tv series happened. However, Klaus had found himself being visited by one Stiles Stilinski from Beacon Hills.
At first, Klaus didn't want to entertain the young lad. After all, what could one mortal possibly have to offer the great Niklaus Mikaelson? But out of the generosity of his heart and perhaps a tiny bit of curiosity, Klaus allows the meeting and he finds himself shocked by what the boy has to offer. Stiles proposes a deal with the devil. On exchange for a very large sum of money, Stiles wants Klaus to bring Stiles' friend, Allison, back from the dead.
At first he begins to scoff at the idea but there is something about the boy that sat in front of him that made him change his mind. He agrees and has Davina raise Allison from the dead only long enough for the hybrid Original to turn her.
Klaus was content to allow the young new hybrid to return to her home, however, it was Elijah's insistence that made Klaus decide to help Allison. At least Klaus doesn't have to do it alone. He knows his family will help when needed.[AU made with inspiration from this video]