Kathryn Hahn (born July 23, 1974) is an American actress known for her roles on the television series Crossing Jordan, Transparent and the film Bad Moms.

Kathryn Hahn plays as Paige (voice) in WandaVision.
Kathryn Hahn is the top #1 member of the cast and appears in 26 episodes.

Paul Bettany (born 27 May 1971) is a British-American actor. He is known for his role as J.A.R.V.I.S. and Vision in the Marvel Cinematic Universe films Iron Man (2008), Iron Man 2 (2010), The Avengers (2012), Iron Man 3 (2013), Avengers: Age of Ultron (2015), Captain America: Civil War (2016), and Avengers: Infinity War (2018). He reprised his role in the Disney+ series WandaVision (2021). He first came to the attention of mainstream audiences when he appeared in the British film Gangster No. 1 (2000), and A Knight's Tale (2001). He has gone on to appear in a wide variety of films, including A Beautiful Mind (2001), Master and Commander: The Far Side of the World (2003), Dogville (2003), Wimbledon (2004), The Da Vinci Code (2006), Margin Call (2011), and Solo: A Star Wars Story (2018). He is portraying Alexander Nix in an upcoming film on the Cambridge Analytica scandal. He has been nominated for various awards, including BAFTA Award for Best Actor in a Supporting Role and a Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture. Description above is from the Wikipedia article Paul Bettany, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Paul Bettany plays as Ted Kaczynski in WandaVision.
Paul Bettany is the top #2 member of the cast and appears in 8 episodes.

Elizabeth Chase Olsen was born on February 16th, 1989 in Sherman Oaks, California, USA to Jarnette and David Olsen (now divorced). Elizabeth has five siblings, famous older sisters Mary-Kate & Ashley, big brother Trent and younger stepsiblings, Taylor and Jake (from her father’s remarriage). She appeared in her older sisters movies How the West Was Fun in 1994 and The Adventures of Mary-Kate & Ashley: The Case of the Mystery Cruise in 1995. Elizabeth is a graduate of NYU Tisch School of the Arts and the Atlantic Theater Company Acting School in New York City. Her breakthrough came in 2011 when Elizabeth starred in the independent thriller drama Martha Marcy May Marlene, for which she was nominated for the Broadcast Film Critics Association Award for Best Actress and Independent Spirit Award for Best Female Lead, among other awards. Elizabeth subsequently starred in the films Silent House (2011), Liberal Arts (2012), Oldboy (2013), Godzilla (2014), I Saw the Light (2015), Ingrid Goes West (2017), and Wind River (2017). Olsen portrays Wanda Maximoff/Scarlet Witch in the Marvel Cinematic Universe. She has portrayed the character in Captain America: The Winter Soldier (2014), Avengers: Age of Ultron (2015), Captain America: Civil War (2016), Avengers: Infinity War (2018), Avengers: Endgame (2019). She reprises her role in the Disney+ series WandaVision (2021), and Doctor Strange in the Multiverse of Madness (2022). Wikipedia, under the Creative Commons Attribution-Share-Alike License 3.0

Elizabeth Olsen plays as Wanda Maximoff, Scarlet Witch in WandaVision.
Elizabeth Olsen is the top #3 member of the cast and appears in 5 episodes.

Teyonah Parris (born September 22, 1987) is an American actress. She began her career playing a recurring role as Dawn Chambers in the AMC drama series, Mad Men, before landing her breakthrough role in the 2014 independent film Dear White People. In 2015, Parris starred in the satirical drama film Chi-Raq directed by Spike Lee.

Teyonah Parris plays as Monica Rambeau, Geraldine in WandaVision.
Teyonah Parris is the top #4 member of the cast and appears in 5 episodes.