Elizabeth Olsen and Paul Bettany reprise their respective roles as Wanda Maximoff / Scarlet Witch and Vision from the film series, with Debra Jo Rupp, Teyonah Parris, Evan Peters, Randall Park, Kat Dennings, and Kathryn Hahn also starring.

The series finale was designed as an MCU film-style conclusion with a large amount of fighting and visual effects, and it introduces a new Scarlet Witch costume.

Critics praised the performances, visual effects, and payoff for the series' emotional arc, but had mixed reactions to the action-oriented climax and Peters' character reveal.

Monica Rambeau removes a magical necklace from "Pietro Maximoff", releasing him from Harkness's control and revealing his true identity as Ralph Bohner.

In a mid-credits scene, Hayward is arrested while Rambeau is informed by a Skrull disguised as an FBI agent that a friend of her mother Maria wants to meet with her in space.

[20] Schaeffer knew the fight between the two Visions would end in a logic battle, with series writer Megan McDonnell conceiving a conversation about the Ship of Theseus.

"[26] Maximoff's "walk of shame" through the town at the end of the episode was conceived to be "like an assault of death glares from people", with Feige requesting more from that moment so the audience could "understand that what she did was terrible".

[29] Schaeffer said the episode's end credits scenes were the biggest connective tissue between the series and future Marvel projects, and were being re-written until late in the process to make sure they covered what was needed for the hand-offs.

[33] The episode stars Elizabeth Olsen as Wanda Maximoff / Scarlet Witch, Paul Bettany as Vision and The Vision, Debra Jo Rupp as Sharon Davis, Teyonah Parris as Monica Rambeau, Evan Peters as Ralph Bohner / "Pietro Maximoff", Randall Park as Jimmy Woo, Kat Dennings as Darcy Lewis, and Kathryn Hahn as Agatha Harkness / "Agnes".

[43] Rubeo wanted Harkness's witch costume to be a dress made from 10 layers of fabric that were each a different color and texture, which she was able to show due to the wire work that Hahn does in the episode.

[31] Shakman originally filmed a sequence in which Rambeau, Bohner, and Lewis meet up with Billy and Tommy in Harkness's house and try to steal the Darkhold from the basement.

[51][35]: 44:51–45:11  Digital Domain created the Hex boundary, using the magnetized CRT television screen design that was established in earlier episodes,[52] including when Maximoff opens it which uses erratic-looking tears in the wall with a glitch effect.

[53] This causes Vision, Billy, and Tommy to start coming apart, which was inspired by imagery from the "House of M" comic book storyline by Brian Michael Bendis and Olivier Coipel.

Bettany wore a bald cap and face makeup on set to match Vision's color, as well as tracking markers for the visual effects teams to reference.

[55] Complex 3D and digital makeup techniques were then used to create the character, with sections of Bettany's face replaced with CGI on a shot-by-shot basis; the actor's eyes, nose, and mouth were usually the only elements retained.

[53] Digital Domain originally were creating Harkness's magic to just be a purple version of Maximoff's,[52] but ended up adjusting it to have a black, ink-like texture to match the design that was developed by Framestore for the previous episode.

[57][52] For the initial confrontation with Harkness at the start of the episode, Digital Domain replaced bluescreen background elements with a 2.5D matte painting that extended the cul de sac.

For the main aerial fights in the episode, they created a digital environment based on plates that we shot at the Disney Ranch and Blondie Street as well as the town of Eatonton, Georgia, outside of Atlanta which inspired some of Westview's "small-town feel".

[53] When Harkness and Maximoff were both in the air, the Digital Domain team treated the camera as if it was being held by a third flying witch and made sure it moved within the 3D environment in the same way that the two characters did to create natural movements for the sequence.

ILM merged the three shots to create a seamless transition, and then replaced Bettany with a digital version of Vision with the actor's performance replicated onto the 3D face.

The digital model is broken up to reveal glowing wires and particles that swirl and dissipate, with some of these created in 2.5D so that they existed within the 3D environment but moved in relation to the plane of the camera.

Ethan Anderton of /Film said the change was subtle and strange, expressing concern that Marvel had the ability to go back to content they had released to make adjustments.

[65] Composer Christophe Beck referenced Michael Giacchino's main theme from Doctor Strange (2016) for the post-credits scene where Maximoff studies the Darkhold in her astral form.

It is heard on the track "Reborn",[67] which was digitally released, along with the rest of Beck's score, as part of the episode's soundtrack album by Marvel Music and Hollywood Records on March 12, 2021.

[76] The release includes deleted scenes from this episode: one revealing that Ralph Bohner is Jimmy Woo's witness, and one with "Agnes" talking to the police while an in-universe laugh track plays.

[77][78][79] Nielsen Media Research, which measures the number of minutes watched by United States audiences on television sets, listed WandaVision as the second most-watched original streaming series for the week of March 1 to 7, 2021.

[82] Writing for Den of Geek, Rosie Knight stated, "for the most part, Matt Shakman and Jac Schaeffer do a solid job of tying up the many loose ends.

Unlike Purslow, Robinson did not mind the reveal that Peters' role was less substantial than some predicted, and found it refreshing that no "eleventh hour, last-minute Big Bad" appeared in the series.

However, he felt the episode, which he gave a "B−", lost its emotional stakes in the fighting and spectacle, suffering from the superhero film cliché of having problems in their final act.

In this episode, TVLine felt Hahn "relished every moment" of being a villain, with a performance that "oozed with wicked delight" and a "top-notch" witch cackle.