The latest episode of Agatha All Along shared some pretty huge details about Teen 's backstory, including how he became Billy Maximoff and what drew him back to Westview. But alongside the big revelations, more details were also revealed about his sigil, and it seems like a very familiar witch is behind the spell…

After looking at him for a split second, Agatha chuckles and says “Are you sure? You’re so much like your mother.”

Here’s the shake: It’s long been believed that the Heartstopper star would be portraying Billy Kaplan — who is really the reincarnated soul of Wanda’s son Billy Maximoff — but this is finally the confirmation we have all been waiting for.

You can read our guide to 'who is Teen in Agatha All Along' for the full breakdown but essentially in the final moments of episode 5, which is titled 'Darkest Hour, Wake Thy Power', it's seemingly revealed that Locke is actually playing Wanda's son Billy Maximoff, who is better known as Wiccan in the comics.

Agatha All Along's sixth episode finally revealed who placed the sigil spell on Teen, and the truth reveals just how important he really is.

Agatha All Along Episode 6 deepens the intrigue surrounding Teen's journey by uncovering the mystery behind the sigil placed on him. With magical undertones and a complex past, the episode reveals key actions that shape Wiccan's future while delving into his connection to Wanda Maximoff.