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Spoiler alert: This post contains plot points from the May 13 episode of 

Despite Klaus’ best efforts, he could not convince Marcel to forgive him. He also couldn’t stop Elijah from ripping out Marcel’s heart.

Now, while Klaus grieves the loss of Marcel, what he doesn’t know is that the person he considered his son is now his greatest threat. “For me, what sets [Marcel] apart [as a villain] is all of Klaus’ issues with Mikael, he sees echoed in Marcel,” Joseph Morgan says. “And we saw that Marcel has these issues with his own father. His father in fact tried to kill him as my father tried to kill me, so there’s a lot of feeling like maybe if Klaus can’t fix himself, he can fix Marcel, he can fix what’s happened to Marcel, and so in doing so, he’ll find some peace in what’s happened to him. So I still feel like for him, it’s a very personal quest in terms of making things right with Marcel. And so that carries a lot of emotional weight in terms of them becoming enemies now.”

As for the strain that Marcel’s death is putting on Klaus and Elijah’s relationship, Morgan says there’s not much time to deal with that in the finale. “We’re on this rollercoaster now, and there’s no getting off it, so there’s not really time to express that because this situation is happening with Marcel, and so that’s the only thing we’re driven by. Marcel is kind of dictating the rules now, and we’re jumping through the hoops. There’s definitely a feeling of, ‘What the hell did you do?’ But there’s not much time to sit and dispute that because of what’s happening right in front of our faces.”

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