Agatha All Along: Who Does Joe Locke Play in the MCU Series?

Warning: The following article contains spoilers for Agatha All Along Episode 5, “Darkest Hour / Wake Thy Power.”

The true identity of Heartstopper star Joe Locke’s character was Agatha All Along‘s biggest mystery, but thanks to Episode 5 we finally the know the answer. So, who does Joe Locke play in Agatha All Along?

Who Joe Locke Plays in Agatha All Along

While Joe Locke is currently credited as “Teen in Agatha All Along, the MCU show’s fifth installment, “Darkest Hour / Wake Thy Power,” confirms he’s Billy Kaplan/Wiccan. For those less versed in Marvel Comics lore, that makes Locke the reincarnated son of Elizabeth Olsen’s Wanda Maximoff/Scarlet Witch.

The big reveal of Teen’s true identity doesn’t come as a shock to most fans, as a sizeable amount of evidence already linked Locke to the Billy role. In November 2022, Deadline‘s sources described Locke as playing “a gay teen with a dark sense of humor,” which broadly aligns with Billy’s comics characterization. Then, in April 2023, Locke’s co-star Patti LuPone told Entertainment Weekly that his character is a familiar in Agatha’s coven – a dynamic that ties in with Wiccan’s magic-based powers.

But most tellingly of all, Mashable listed Locke as Billy Kaplan/Wiccan in an August 2023 profile of fellow Agatha All Along cast member Sasheer Zamata that’s since been redacted. Similarly, Locke’s Agatha stunt double Jamie Sears reportedly unpublished a version of his CV that credited Locke as Billy. Finally, legit-looking Funko Pop promotional images surfaced online following Agatha All Along‘s September 2024 release that labelled Locke’s character as Wiccan. So, yeah: most folks saw this coming!

Related: Will Agatha All Along Break Marvel’s Biggest TV Curse?

What Do We Know About Wiccan From Marvel Canon?

Wiccan’s comic book history is a bit complicated, even by Marvel’s standards. The short version is that Billy Kaplan is the reincarnation of Wanda Maximoff/Scarlet Witch’s son Billy Maximoff. Billy Maximoff’s twin brother, Tommy, was reborn as well, but to different parents. So, the pair are still siblings, but only in the sense that their souls are “related.” Further confusing matters, Billy and Tommy are both the spitting image of their past selves (albeit with different colored hair).

Related: Agatha All Along Episode 4 Shuts Down a Major Teen Theory

It’s worth noting that Billy and Tommy Maximoff both appear in WandaVision. As in the comics, they’re conjured up by Wanda, who later reluctantly wipes them from existence. Alternate universe versions of the twins also show up in Doctor Strange in the Multiverse of Madness. Presumably, Agatha All Along‘s version of Billy is modelled on the Billy Kaplan character, not the Billy seen in Multiverse of Madness.

Agatha All Along is currently streaming on Disney+, with new episodes dropping Wednesdays.