Not too much is known about Rio Vidal yet. She was introduced in the first episode of Agatha All Along, posing as a detective in the spell that Wanda had put Agatha under. From the start, she and Agatha have a bad history.

Agatha All Along is giving us some answers, while raising new questions, in episode 4 this week, though it does seem to be slowly spelling something out. That would be the true identity of Aubrey Plaza’s Rio Vidal, a Green Witch. Or rather, the Green Witch, as she says.

Agatha All Along Episode 4 hints at an old connection between Rio Vidal and Agatha Harkness. Here's everything you need to know about it.

Right at the end of the episode, Agatha and the rest of the coven swap stories about their battle scars. Rio's, it turns out, is more of an emotional one as she tells the group: "A long time ago, I loved someone, and I had to do something that I did not want to do, even though it was my job. And it hurt them." Okay, well, now we're convinced...

Agatha All Along episode 4 revealed more about Agatha Harkness and Rio Vidal's intense and mysterious relationship prior to the series.