M Mary MacPherran / Titania

Mary MacPherran (portrayed by Jameela Jamil), also known as Titania, is a social media influencer with incredible strength who is obsessed with She-Hulk, ultimately becoming her rival.

the character has appeared in one project: the Disney+ series She-Hulk: Attorney at Law (2022).

Brett Mahoney

Makkari

Makkari (portrayed by Lauren Ridloff) is an Eternal who can move at superhuman speeds. She is implied to harbour romantic feelings for Druig.

The character is the first deaf superhero in the MCU. Ridloff stated that she started running and muscle-building to have "the symmetry of somebody who looks like a sprinter".

the character has appeared in one project: the film Eternals (2021).

Malekith the Accursed

Malekith the Accursed (portrayed by Christopher Eccleston) is the king of the Dark Elves who faces Thor in 2013. Eons ago, he faces Odin's father Bor and is defeated, being exiled to an alternate reality. He is awakened when the Aether is released, and he merges with it, plotting to submerge Earth in darkness during the convergence. He is killed when his own ship crushes him on Svartalfheim.

the character has appeared in one project: the film Thor: The Dark World (2013). An alternate universe variant of Malekith (voiced by Steven French) appeared in one project: the Disney+ animated series What If...? (2021–2024).

Gideon Malick

Mantis

Vanessa Marianna-Fisk

Flint Marko / Sandman

Flint Marko (motion-captured by Jon Watts and voiced by Thomas Haden Church), also known as the Sandman, is a small-time thief from an alternate universe who received an ability to transform into sand. He is one of the villains imprisoned by Doctor Strange, and rejects the cure that Spider-Man (Peter-1) attempts to give him. He is eventually cured and safely sent to his own dimension.

the character has appeared in one project: the film Spider-Man: No Way Home (2021). Church reprises his role from Sam Raimi's Spider-Man film series (2002–2007).

Martinex

(portrayed by Michael Rosenbaum) is a member of Stakar Ogord's team of Ravagers. He visits Yondu Udonta on Contraxia along with Stakar to remind him that he is in exile for breaking the Ravagers' code. After Yondu sacrifices himself to save Peter Quill, Martinex and Stakar are moved by his sacrifice, and he and the other Ravagers attend his funeral. The two of them decide to bring the rest of the team back together to honor him.

the character has appeared in two projects: the films Guardians of the Galaxy Vol. 2 (2017) and Guardians of the Galaxy Vol. 3 (2023).

Mar-Vell / Wendy Lawson

Mar-Vell (portrayed by Annette Bening) is a Kree scientist who rejected her species' war with the Skrulls. She fled to Earth in the 1980s and adopted the alias of Dr. Wendy Lawson, a physicist at Project Pegasus. Using the Tesseract, she sought to develop an experimental engine that would have allowed the Skrulls to settle beyond the reach of the Kree Empire. She is killed by Yon-Rogg, though she is able to instruct Carol Danvers to destroy the engine before Yon-Rogg is able to seize the device. The Supreme Intelligence later takes on her appearance while conversing with Danvers.

the character has appeared in one project: the film Captain Marvel (2019). An alternate universe variant of Mar-Vell (voiced by Keri Tombazian) appeared in one project: the Disney+ animated series What If...?.

Mila Masaryk / Unicorn

Mila Masaryk (voiced by Sarah Natochenny) is a Russian criminal in an alternate universe who is part of a group of Russian bank robbers. During a robbery, Mila's accomplices—Dmitri Smerdyakov, Mikhail Sytsevich, and Roxanna Volkov—are arrested, while she escapes with the stolen money and takes it to the renegade scientist Otto Octavius, who sells Mila a high-tech helmet that shoots lasers and analyzes and predicts opponent's movement patterns. Mila, calling herself Unicorn, uses the helmet to help her cohorts escape from prison and nearly kills Spider-Man, but is stopped by Mikhail, who removes Mila's helmet, and Spider-Man apprehends them both.

the character has appeared in one project: the Disney+ animated series Your Friendly Neighborhood Spider-Man (2025–present).

Phineas Mason

Phineas Mason (portrayed by Michael Chernus) is a weapons maker and part of a salvage company alongside Adrian Toomes, Herman Schultz, and Jackson Brice. When the salvaging company goes out of business due to the Department of Damage Control, Mason helps Toomes steal leftover technology from the Avengers' battles and build advanced weapons out of the technology, such as Toomes's flight suit and modified versions of Brock Rumlow's vibro-blast emitting gauntlets. While his assistants were defeated by Spider-Man and arrested by the authorities, Mason's fate is left unknown.

the character has appeared in one project: the film Spider-Man: Homecoming (2017).

Rick Mason

Rick Mason (portrayed by O-T Fagbenle) is an old friend of Natasha Romanoff's S.H.I.E.L.D. past. In 2016, he helps her while she is a fugitive. In 2026, he assists Nick Fury.

the character has appeared in two projects: the film Black Widow (2021); and the Disney+ series Secret Invasion (2023).

Ebony Maw

Ebony Maw (voiced and portrayed via motion capture by Tom Vaughan-Lawlor) is an adopted son of Thanos and member of the Black Order who is killed in space after being defeated by Tony Stark and Peter Parker. A past version of Maw from 2014 travels through time with Thanos's forces to stop the Avengers from foiling his plans. However, they are all disintegrated when Stark uses the Infinity Gauntlet.

the character has appeared in one project: the film Avengers: Infinity War (2018). Alternate universe variants of Maw appeared in two projects: the film Avengers: Endgame (2019); and the Disney+ animated series What If...?.

Billy Maximoff / William Kaplan

William "Billy" Maximoff (portrayed by Baylen Bielitz as a five-year old and Julian Hilliard as a ten-year old) is the son of Wanda Maximoff and Vision, and the younger twin brother of Tommy Maximoff. He was created by Wanda using chaos magic within the Westview anomaly in Westview, New Jersey, a reality modeled after a fictional sitcom inspired by those Wanda watched as a child whose residents are mind-controlled by Wanda. After Wanda "gives birth" to Billy, he ages rapidly to five and ten years old, acquiring supernatural abilities: Billy harnesses chaos magic like his mother. Following a battle between Wanda and the witch Agatha Harkness, Wanda dissolves the Westview anomaly, erasing the imaginary existence of Billy. Billy reincarnates upon his "death" in the body of William Kaplan (portrayed by Joe Locke), a 13-year-old from Westview's neighboring town of Eastview, who was killed in a car accident after leaving his bar mitzvah early; stricken with amnesia, Billy then assumes William's identity, unaware of his past life.

Following Wanda's death, Billy's curiosity about the anomaly that occurred the day of his car crash leads him to investigate and learn that Wanda and Vision had children in Westview, one of whom had the same abilities that he has. Realizing his true identity, he becomes determined to find his lost brother. He frees Harkness from a spell placed by Wanda and asks that she take him on the Witches' Road, a magical pathway where one's desires are granted after completing a series of "trials". In the final trial, Billy locates Tommy's soul and places it in the body of a drowning boy. After discovering that the Witches' Road was a myth created by Harkness and that he had willed it into existence, he accepts the mentorship of Harkness, who dies and returns as a ghost, and sets out to search for Tommy.

the character has appeared in two projects: the Disney+ series WandaVision (2021) and Agatha All Along (2024). An alternate universe variant of Billy appeared in one project: the film Doctor Strange in the Multiverse of Madness (2022).

Kaplan family William Kaplan's family plays an important role in his life. Jeff (portrayed by Paul Adelstein) and Rebecca Kaplan (portrayed by Maria Dizzia) are William's parents.

the characters have appeared in one project: the Disney+ series Agatha All Along.

Pietro Maximoff

Pietro Maximoff (portrayed by Aaron Taylor-Johnson as an adult and Gabriel Gurevich as a child) is Wanda Maximoff's twin brother. They are introduced as Hydra assets, both acquiring superhuman powers after volunteering to be experimented upon by the Mind Stone, with Pietro gaining superhuman speed. Harboring a lifelong hatred for American arms manufacturer Tony Stark, whose bombs killed their parents, they side with Ultron against the Avengers before later switching sides. In the final conflict with Ultron, Pietro dies a hero's death, saving the lives of Clint Barton and a Sokovian boy. In 2023, the witch Agatha Harkness forces Westview resident Ralph Bohner (portrayed by Evan Peters) to impersonate Pietro to get close to Wanda within her created alternate reality.

The character's reception has been lukewarm with complaints that the character or his power was not developed enough compared to the comic book version or 20th Century Fox's X-Men film series version.

the character has appeared in three projects: the films Captain America: The Winter Soldier (2014) (mid-credits cameo) and Avengers: Age of Ultron (2015); and the Disney+ series WandaVision.

Tommy Maximoff

Thomas "Tommy" Maximoff (portrayed by Gavin Borders as a five-year old and Jett Klyne as a ten-year old) is the son of Wanda Maximoff and Vision, and the older twin brother of Billy Maximoff. He was created by Wanda using chaos magic within the Westview anomaly in Westview, New Jersey, a reality modeled after a fictional sitcom inspired by those Wanda watched as a child whose residents are mind-controlled by Wanda. After Wanda "gives birth" to Tommy, he ages rapidly to five and ten years old, acquiring supernatural abilities: Tommy gains superhuman speed like his uncle "Pietro Maximoff" (in reality, Ralph Bohner in disguise). Following a battle between Wanda and the witch Agatha Harkness, Wanda dissolves the Westview anomaly, erasing the imaginary existence of Tommy. While traveling the Witches' Road, Agatha helps a reincarnated Billy connect with Tommy's soul and place it in the body of a teenager who had drowned during a botched prank.

the character has appeared in two projects: the Disney+ series WandaVision and Agatha All Along. He will return as (portrayed by Ruaridh Mollica) in the upcoming Disney+ series VisionQuest (2026). An alternate universe variant of Tommy appeared in one project: the film Doctor Strange in the Multiverse of Madness.

Wanda Maximoff / Scarlet Witch

M'Baku

M'Baku (portrayed by Winston Duke) is the leader of the renegade Jabari Tribe, who shun Wakanda's technological society and have a religious reverence for gorillas, such as decorating their armor with white gorilla pelts and worshiping the ape god, Hanuman, as a part of a complex Indo-African religion rather than the Panther god Bast. In Black Panther, M'Baku challenges T'Challa for control of Wakanda. When he is defeated in combat, the latter convinces him to yield. M'Baku returns the favor by looking after the wounded T'Challa following the latter's fight with N'Jadaka and agreeing to look after Ramonda. He initially declines T'Challa's request to help fight N'Jadaka, but ultimately reconsiders and leads the Jabari into battle against him. Following N'Jadaka's death, M'Baku is granted a place on Wakanda's national council.