Halloween's a magical holiday all about family, friends, and the thrill of getting to be someone else for a day!
- Billy Maximoff (Main story and flashback)
- Tommy Maximoff (Main story and flashback)
- "Pietro Maximoff"
- Captain Monica Rambeau
- Dr. Darcy Lewis
- "Norm" / Abilash Tandon (Recap)
- Pietro Maximoff (Recap)
- Iryna Maximoff (Mentioned)
- Carol Danvers (Mentioned)
- Maria Rambeau (Mentioned)
- Olek Maximoff (Mentioned)
- "Herb" / John Collins
- Avengers (Mentioned)
- Major Goodner (Mentioned)
Races and Species:
- Earth-199999 (Main story and flashback)
Disturbances on Halloween separate Wanda from Vision, who looks into anomalous activity in Westview.
|Wanda Maximoff||Elizabeth Olsen|
|Monica Rambeau||Teyonah Parris|
|Jimmy Woo||Randall Park|
|Darcy Lewis||Kat Dennings|
|"Pietro Maximoff"||Evan Peters|
|Director Hayward||Josh Stamberg|
|Agent Monti||Alan Heckner|
|Agent Rodriguez||Selena Anduze|
|Young Wanda||Sophia Gaidarova|
|Young Pietro||Joshua Begelman|
|Toothless Old Woman||Stephanie Astalos-Jones|
|Suburban Woman||Tamara Hetzel|
|Suburban Man||Jon Zimmerman|
|Darcy Double||Christine Renaud|
|Billy Reference||Jackson Robert Scott|
|Commercial Shark (VO)||Adam Gold|
|Commercial Kid (VO)||Tristen Chen|
- Punk artist Kathleen Hanna performed this episode's intro theme, "Let's Keep it Going," along with Kristen Anderson-Lopez, the co-writer/producer of all the series' intro themes.
- This episode pays homage to the early 2000s sitcom Malcolm in the Middle with its intro and with how Billy and Tommy Maximoff talk directly to the camera.
- Pietro references the iconic shower scene from the 1960 film Psycho when pretending to stab Billy and Tommy.
- The entire Maximoff family wears Halloween costumes that are extremely accurate to their respective comic book counterparts' superhero outfits.
- Pietro tells Billy and Tommy, "unleash hell, demon spawn!" This is a nod to Billy and Tommy Maximoff originally being fragments of Mephisto's soul in the comics.
- Tommy and Pietro say, "I feel the need... for speed," referencing the 1980 film Top Gun and Tommy's comic book alias, Speed.
- Wanda lingers on Pietro's use of the word "kick-ass," which could be a nod to the fact that both Quicksilver actors Evan Peters and Aaron Taylor-Johnson (from Avengers: Age of Ultron) both appeared together in the film Kick-Ass.
- The movie theater marquee shows that the superhero family film The Incredibles and the 1998 remake of The Parent Trap are playing in Westview.
- S.W.O.R.D. has a file on an individual named "Ray Johnson," which could be a reference to the character John Wraith, who went by the alias Ray Johnson in the comics.
- Night of the Living Dead is being projected onto the big screen in the town square.