Agatha Harkness is finally back.

After causing a bit of chaos and putting an end to Wanda Maximoff’s idyllic small-town family life in “WandaVision,” the Marvel Cinematic Universe’s favorite treacherous and treacherous witch will star in “Agatha All Along,” a new spinoff series launching Wednesday on Disney+.

Portrayed by Kathryn Hahn, the character was introduced as Wanda and Vision’s nosy neighbor Agnes. The New Jersey housewife’s true identity was eventually revealed as Agatha Harkness, a powerful witch drawn to the neighborhood by Wanda’s magic.

As usual, Marvel Studios has kept much of the new show under wraps. “Agatha All Along” will take place after the events of “WandaVision” and will follow an Agatha who has been stripped of her powers. The series will presumably see the witch up to her old tricks with the help of new friends.

“WandaVision” aired in 2021, and most of the characters, including Agatha, haven’t been seen or mentioned in the MCU in years. Ahead of the premiere of “Agatha All Along,” here’s a refresher on the character, her story, and everything else you need to know.

“Agatha All Along” takes place some time after the events of “WandaVision” and centers on an Agatha who has been stripped of her powers.

(Chuck Zlotnick/Marvel)

Who is Agatha Harkness?

Agatha’s backstory is revealed in episode 8 of “WandaVision”. In 1693 in Salem, Mass., a younger Agatha was dragged to a stake and tied up, accused of betraying her coven. Her alleged crimes included stealing knowledge beyond her age and station and practicing the “darkest” magic.

After Agatha begged for mercy — insisting that she had only broken the rules — her coven, led by her mother, attacked her. Agatha then absorbed all of her coven’s magical powers, killing them in the process. In the “WandaVision” finale, Agatha says that her “thing” is to “take power from the undeserving.”

What was she doing in ‘WandaVision’?

Unlike the other residents of Westview, Agatha is aware of the town’s enchanted state and was simply playing along with Wanda’s sitcom fantasy life. Drawn to Wanda’s reality-altering powers, the ancient witch had been manipulating events to discover how Wanda accomplished the immense magical feat of bewitching an entire New Jersey town. (Speaking of evil, Agatha even admits to killing Wanda’s family dog.)

Eventually, Agatha’s patience runs out and she tries to force Wanda to reveal her secrets. She discovers that the grieving Wanda has wielded chaos magic, transforming her into the mythical Scarlet Witch. Agatha’s desire to steal Wanda’s power for herself leads to an epic magical showdown in the finale of “WandaVision.”

Despite centuries of knowledge, Agatha is unable to defeat the Scarlet Witch. Wanda uses one of the elder witch’s lessons against her, absorbing all of Agatha’s magic instead. Wanda also uses her power to erase Agatha’s mind in order to live out her life in Westview as the nosy neighbor Agnes.

Teen (Joe Locke), left, Rio Vidal (Aubrey Plaza), Agatha Harkness (Kathryn Hahn) and Jennifer Kale (Sasheer Zamata) in “Agatha All Along.” The series will presumably see the witch up to her old tricks with the help of new friends.

(Chuck Zlotnick/Marvel)

What has Agatha been up to since ‘WandaVision’?

There has been no mention of Agatha Harkness in the MCU since the events of “WandaVision,” so presumably she’s still living a magic-free life as Agnes.

Is Agatha like that in the comics too?

Not really. With comic book origins dating back to the late ‘60s, Agatha was introduced in the “Fantastic Four” series as the governess to the child of Reed Richards (Mr. Fantastic) and Sue Storm (the Invisible Woman). Marvel’s first family is set to make its official MCU debut (the 2005 film was released by 20th Century Fox — before being acquired by Disney) in the upcoming “The Fantastic Four: First Steps,” scheduled for 2025.

Generally depicted as an older woman, Agatha is a powerful witch who is eventually called upon to help Wanda with her magic, becoming her friend and mentor. She has been killed a number of times over the years, but that hasn’t stopped her from showing up when needed, even as a ghost. Her son, Nicholas Scratch, is a villain who takes on the Fantastic Four.

Agatha has played a major role in several storylines involving Wanda’s relationship with her children, Billy and Tommy. In the 2015-2017 comic series “Scarlet Witch,” Agatha accompanies Wanda on her journey through the Witches’ Road.

Joe Locke and Kathryn Hahn in “Agatha All Along.”

(Chuck Zlotnick/Marvel)

What is ‘Agatha All Along’?

Set after the events of “WandaVision,” “Agatha All Along” sees the eponymous witch team up with a goth teenager to form a ragtag coven of misfits in an attempt to regain her powers. The spin-off series takes its title from the catchy song written by Kristen Anderson-Lopez and Robert Lopez that revealed Agatha’s identity in “WandaVision” Episode 7.

The nine-episode series, created by “WandaVision” star Jac Schaeffer, also stars Joe Locke, Sasheer Zamata, Ali Ahn, Debra Jo Rupp, Patti LuPone and Aubrey Plaza.

Wait, what happened to Wanda and Vision after ‘WandaVision’?

At the end of the series, Wanda was shown studying Agatha’s copy of the Darkhold, a book filled with dark magic also known as the Book of the Damned. Her desire to be reunited with her children Billy and Tommy leads to the events of “Doctor Strange in the Multiverse of Madness” (2022). Wanda was last seen destroying every copy of the “Darkhold” and being crushed under a pile of rubble in the process.

The Vision that Wanda created with her magic disappeared at the end of “WandaVision” after Wanda reversed the magical curse that altered Westview’s reality. But the reconstructed Vision that was sent to destroy Wanda flew away from the city after accessing his past memories as an Avenger. This Vision’s story will continue in the upcoming series “Vision Quest,” scheduled for release in 2026.