EntertainmentTVAction ShowsMarvel TV ShowsAgatha All AlongAgatha All Along fans have a new theory about Billy that shakes up what those “black heart” references could meanWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works.
EntertainmentTVAction ShowsMarvel TV ShowsAgatha All AlongAgatha All Along fans have a new theory about Billy that shakes up what those “black heart” references could meanWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works.
When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works.
(Image credit: Marvel Studios)

Thanks to a line in Agatha All Along’s opening episode, we’d all assumed that the ‘black heart’ that marked the final name in Lilia’s list of potential coven candidates had been Rio. Now, though, it seems like that could’ve been a misdirect – and fans think they’ve worked out who it wasactuallyreferring to instead.
Warning! The rest of this article contains spoilers for Agatha All Along episode 6.If you’ve yet to tune in, and don’t want to know anything that happens, turn back now!
“You’re my 🖤”, Eddie writes back, and it’s obviously not a coincidence that the youngster using the black version of the emoji…
Now, if you cast your minds back to episode 1, you’ll remember that Rio (Aubrey Plaza) responded to Agatha’s claim she doesn’t have a heart with, “I do. It’s black and it beats for you.” In the second episode, then, when Lilia (Patti LuPone) gave Agatha (Kathryn Hahn) and Billy, known then as ‘Teen’, a list of the witches best suited to join them on the Road, the former guessed it had meant Rio – as did we.
“That’s because you used a black pen!” an annoyed Agatha exclaimed, before marching onto the streets of Westview and inviting ‘Mrs. Hart’ (Debra Jo Rupp) to their “party”.
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Taking to Twitter to react to the new potential twist,one shocked fan tweeted: “Thinking about the fact that the black heart from ep 2 was most likely for Billy (his name probably wasn’t there bc of the sigil) and not Rio…”
“So Billy has been the black heart Lilia referred to this whole time? NOT RIO,“said another, whilea third said: “Guys so he was the black heart? It makes sense since she couldn’t write his name. Hence he’s part of the coven and we’re going to see his trial.”
sooo the black heart was for Billy, but since Lillia put the sigil on him she couldn’t remember his name or anything about him, the heart was a way of telling everyone we was part of the coven but he was already IN thanks to the sigil itself??????? wtf jac i can’t do this pic.twitter.com/u1hkKzGQx9October 17, 2024
sooo the black heart was for Billy, but since Lillia put the sigil on him she couldn’t remember his name or anything about him, the heart was a way of telling everyone we was part of the coven but he was already IN thanks to the sigil itself??????? wtf jac i can’t do this pic.twitter.com/u1hkKzGQx9October 17, 2024
Realizing the black heart wasn’t Rio, but Billy the whole time and Lilia couldn’t write his name because of the sigil. #AgathaAllAlong pic.twitter.com/s3jDMdE5ZMOctober 17, 2024
Realizing the black heart wasn’t Rio, but Billy the whole time and Lilia couldn’t write his name because of the sigil. #AgathaAllAlong pic.twitter.com/s3jDMdE5ZMOctober 17, 2024
THE BLACK HEART??? LILLIA KNEW IT WAS HIM THAT NEEDED TO BE IN THE COVEN?? #AgathaAllAlong pic.twitter.com/KCTLhNeD9tOctober 17, 2024
THE BLACK HEART??? LILLIA KNEW IT WAS HIM THAT NEEDED TO BE IN THE COVEN?? #AgathaAllAlong pic.twitter.com/KCTLhNeD9tOctober 17, 2024
Not everyone is keen on the theory, though, whether it turns out to be accurate or not.
“The black heart was for Billy.” They needed a green witch. Last time I checked Billy isnt a green witch but okay,“argued one viewer, asanother wrote: “The black heart thing with Billy is just a red herring to make us think otherwise about Rio.[Trust] me when I say this.”
“NAHHHH IF BILLY IS BLACK HEART I WILL ACTUALLY [REDACTED],“tweeted a third.
#AgathaAllAlong spoilers 🤫The coven being part of Billy’s life from the beginning pic.twitter.com/zsgDKAJMaOOctober 17, 2024
#AgathaAllAlong spoilers 🤫The coven being part of Billy’s life from the beginning pic.twitter.com/zsgDKAJMaOOctober 17, 2024
Agatha All Along episodes 1 to 6 are streaming now. Ensure you don’t miss a thing with ourAgatha All Along release schedule.
For more on the wider MCU, check out our guide to all of theupcoming Marvel movies and showsor get up to speed with our breakdown of theMarvel timeline.
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