Chilling Adventures of Sabrina Season 1 Episode 16
Chapter Sixteen: Blackwood
Zelda and Blackwood's wedding is coming up and not everyone is happy about it. But the Anti Pope is set to marry them so Sabrina has to figure out how to show who he is without it being obvious what she is up to.
Her dad's ghost arrives to say that Blackwood isn't good news so she gets Nick to fetch the manifesto from the ocean that her dad was going to give the Anti Pope.
They try to give it to him before Blackwood manages to give his, but that night the Anti Pope dies and it looks like Ambrose did it.
They try to hide him, and when Ambrose spits out his familiar that was given to him by Blackwood, he figures out that he was used. The mouse controlled him so he could do what Blackwood wanted of him.
Nick and Sabrina try to trick Blackwood at his wedding by appearing like her parents to call him out, which he figures out and calls them out on. Zelda and Blackwood end up getting married privately before anyone could stop them again, and right away he puts Zelda in her place in their marriage.
Zelda expects to be by his side, but he tells her she must walk behind him.