Agatha All Along included the reveal that Teen is Billy Maximoff and raised many questions in the process, chief among them what happened to the Maximoff twins in the MCU. The question of Joe Locke’s Marvel identity has been common since Agatha All Along‘s premiere, with many theories and rumors circulating about his character. Thankfully, Agatha All Along episode 5’s ending seemingly put an end to these rumors by confirming him as the son of Wanda Maximoff, Billy Kaplan.

However, to those uninitiated with Marvel Comics, this reveal may come as a shock. The question of how Billy can be depicted as he is after WandaVision‘s climactic ending is undoubtedly a valid one, making the history of Billy and his brother Tommy one worth exploring. As the cast of Agatha All Along continues to dwindle in populace but increase in intrigue, the history of Billy and Tommy comes into full question, as does how one or both of the twins are now active once more in the MCU.

WandaVision’s Tragic Ending For Scarlet Witch’s Sons Explained

Wanda’s Twins Were Never Real In The Mainline MCU

Billy and Tommy Maximoff were first introduced to the MCU in 2021’s WandaVision. The show centered around the titular characters living out their fantasy world via a series of sitcom episodes, though was later revealed to be much darker in nature. Following Avengers: Endgame and her immeasurable grief after Vision’s death, Wanda journeyed to the town of Westview where her synthetic partner was planning to buy them a home. In an outpouring of grief and chaos magic, Wanda enveloped Westview in a Hex, which enslaved all the townsfolk as “cast members” in Wanda’s idyllic TV show.

Midway through this show, Wanda used her magic to create two children. These children were twins named Billy and Tommy. The former was created to manifest Wanda’s powers of magic, while the latter had his uncle Pietro’s powers of superspeed. Eventually, Agatha Harkness broke Wanda’s Hex by alerting the newly-crowned Scarlet Witch to what she had really down in enslaving Westview’s citizens. Wanda decided to break the Hex in order to free the townspeople, but this meant her dream life fell apart.

As the Hex dissipated for good, Billy and Tommy disappeared as they were only ever a figment of Wanda’s magical powers…

The final house to leave the Hex was Wanda and Visions, who said goodbye to their children. As the Hex dissipated for good, Billy and Tommy disappeared as they were only ever a figment of Wanda’s magical powers. WandaVision‘s ending then led into the story of Doctor Strange in the Multiverse of Madness where Wanda tried to retrieve her children using the Darkhold, resulting in the Scarlet Witch’s MCU death.

How Billy Is Back In Agatha All Along – All Clues & Theories

The Multiverse, Marvel Comics, & Other Methods That Could Explain Billy’s Revival

With the reveal that Joe Locke’s Teen is Billy, the burning question now is how he is back; As explored, the Billy Maximoff of WandaVision was never real. Regardless, he is part of Agatha All Along‘s witch coven, and the MCU could have several explanations concerning how he is back. Doctor Strange in the Multiverse of Madness confirmed that Billy and Tommy are real in the multiverse, with other variants of Wanda Maximoff having children. As such, it could be as simple an explanation as Agatha All Along‘s Billy is one from another universe.

Another possibility is that Wanda used her waning magic before her death to actively create other versions of her children. The Darkhold was a pathway to many dark abilities after all, meaning Wanda could have figured out a way to revive her children from WandaVision as living beings before she died. However, the most likely theory that explains how Billy is back comes from Marvel Comics. Before exploring this, though, it is worth running through the Easter eggs in Agatha All Along that all but confirm Teen as Billy.

The first comes from the sigil placed on Teen that stops him from revealing his name or backstory to witches. This was likely cast by Wanda to keep the identity of her son hidden and thus, out of danger. Secondly, Teen told Alice in Agatha All Along episode 3 that a lot happened to him when he was 13 which, in-universe, was the same year WandaVision took place.

Finally, Agatha All Along episode 5 provided the biggest hints yet. Agatha comments at the end of the episode that Teen is just like his mother, leading him to unleash blue magical powers, the same color wielded by Wanda’s son in both WandaVision and Marvel Comics. The episode ends with Teen wearing a crown almost identical to that of the Scarlet Witch’s, all but confirming him as Billy Kaplan.

So Where’s Tommy?!

The Other Maximoff Twin Remains Hidden

Before exploring the comic book origins of Billy and Tommy, it should be pointed out that the MCU has yet to give any hints about the latter. Billy’s confirmation in Agatha All Along episode 5 makes Tommy’s absence all the more intriguing as the MCU seemingly builds towards the Young Avengers. As of Agatha All Along episode 5’s ending, it is unknown where Tommy is. That said, there are a few hints from Marvel Comics that could answer this mystery, and hint at the two twins being reunited in the future of the MCU should the source material be followed.

How Marvel Comics Answer The Mystery of Billy & Tommy

The Origins Of The Maximoff Twins Explained

If the MCU does indeed follow the comics, the most likely explanation behind Billy and Tommy being part of the live-action universe stems from the concept of reincarnated souls. In the source material, Wanda’s creation of Billy and Tommy was similar to how it was presented in WandaVision, only with one notable difference. In the former, Wanda used two lost souls to physically create the twins, something that was not mentioned in WandaVison. The devil Mephisto then claimed the souls back, only for them to escape and be reincarnated into two boys: Billy Kaplan and Tommy Shepherd.

WandaVison could be retconned to explain that Wanda used two lost souls to create Billy and Tommy, thus explaining how their reincarnation in the MCU.

The reincarnated soul of Billy eventually discovers his magical powers and also finds out that his boyfriend, Teddy Altman, is a Kree-Skrull hybrid. The two tell each other about their powers and eventually join the Young Avengers. Teddy was also teased in Agatha All Along episode 2, with Teen/Billy receiving a call from someone saved in his phone as “Boyf.” Eventually, it is through the Young Avengers that Billy is reunited with his reincarnated twin, Tommy.

Potential MCU Young Avengers Line-Up
Introduced In

Billy Kaplan/Wiccan
WandaVision/Agatha All Along

Kate Bishop/Hawkeye
Hawkeye

Cassie Lang/Stinger/Stature
Ant-Man

Kamala Khan/Ms. Marvel
Ms. Marvel

Tommy Shepherd/Speed
WandaVision

Riri Williams/Ironheart
Black Panther: Wakanda Forever

Eli Bradley/Patriot
The Falcon and the Winter Soldier

While Billy was uncovering his magical powers in New York, the reincarnated soul of Tommy Shepherd was doing the same in New Jersey. Tommy accidentally vaporizes his school using his superspeed and is thus imprisoned and experimented on. After some time, the Young Avengers free Tommy and he joins the team as Speed. After several adventures, Billy and Tommy discover they are the reincarnated souls of Scarlet Witch’s twins, confirming their fraternal bond.

As alluded to, Tommy is nowhere to be seen in Agatha All Along. This could mean that Billy’s story is left off for an MCU future after the show ends, potentially tying him with the Young Avengers. In a Young Avengers story, Billy could free Tommy and the missing half of Wanda’s twins could be confirmed for an MCU future beyond the story of Agatha All Along.