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A new supervillain team who was founded during the Time Skip between season 2 and 3. They started as a relatively inefficient and harmless group, with potentially dangerous powers, but not smart or coordinated enough to use them to their full potential, meaning they would usually get easily defeated by the Avengers. Eventually however, Baron Zemo contacted them and became their leader, turning them into a genuine threat.
- Adapted Out: Jolt, the team's Token Good Teammate and Morality Pet, is not present in this version.
- Becoming the Mask: Most of the team became actual heroes with the exception of Baron Zemo.
- Card-Carrying Villain: The Masters of Evil. The Avengers frequently like to point out how ridiculously Obviously Evil this is.
- Harmless Villain: They start out as a rather incompetent team the Avengers are unable to take seriously... then Zemo joins them.
- HeelFace Turn: Ultimately, the team turns against Zemo, and decide to become real heroes after turning themselves in.
- By season five, even Zemo himself claims to have decided he doesn't have to follow in his father's footsteps, intending to leave his old ways behind. During his time in Wakanda, the main conflict between him and the Black Panther is that Zemo wants to destroy the elder Zemo's research for being too dangerous to use, while Panther believes that it's their best shot at taking down the Shadow Council. Of course, only time will tell if Zemo is sincere - if he's not, he wouldn't be the first villain in the show to put a lot of time into faking a HeelFace Turn.
Moonstone / Meteorite
Voiced by: Elizabeth Daily
- Adaptational Heroism: Sort of. While she did defect in the comics, she still was a Token Evil Teammate at best who sided with the good guys for selfish reasons and would still engage in less-than-moral actions. Her HeelFace Turn in this version appears more genuine.
- Amazonian Beauty: She has a very muscular body as Meteorite.
- Bare Your Midriff: A full bodied example. The costume she wears as Meteorite highlights her toned stomach.
- Deadpan Snarker: Is probably the most openly sarcastic member of the team.
- Flying Firepower: As Meteorite, she can both fly and shoot energy beams in addition to her intangibility
- Form-Fitting Wardrobe: She wears these for her two costume personas.
- Intangible Man: Her main ability.
- Most Common Super Power: As Meteorite, she has a very impressive bust.
- Ms. Fanservice: As Meteorite, she is a very beautiful woman who has long blonde hair and wears a very form fitting costume that highlights her muscular yet voluptuous body, toned stomach, buxom breasts, and long muscular legs.
- Rapunzel Hair: She has very long, flowing blonde hair that reaches her back.
- She's Got Legs: As Meteorite, she has long muscular legs that are highlighted by her costume.
Fixer / Techno
Voiced by: Rick D. Wasserman
- Adaptation Origin Connection: It's briefly mentioned in "Under Siege" that he used to work for Stark Industries until Tony fired him. In the comic, he had absolutely no relation to either Stark Industries or Iron Man.
- Adaptational Heroism: In the comics, Fixer actually sided with Zemo after the Thunderbolts were exposed. Here, he joins the rest of the team in turning on him.
- The Evil Genius: By virtue of being the most tech-oriented member of the team.
Goliath / Atlas
Voiced by: Jesse Burch
Screaming Mimi / Songbird
Voiced by: Jennifer Hale
- Bare Your Midriff: The costume she wears as Songbird highlights her toned stomach.
- Chuck Cunningham Syndrome: Becomes an official reserve Avenger at the end of Season 3, but is inexplicably not recruited as part of Black Panther's new Avengers line-up in Season 4. She doesn't even get mentioned.
- 11th-Hour Ranger: First joins the Mighty Avengers during the Civil War arc, but defects to the old Avengers for the rest of the finale.
- Green Lantern Ring: As Songbird, her power has been modified by equipment so she can channel her sonic scream into sound-based constructs.
- HeelFace Turn: Twice. First against Baron Zemo while as part of the Masters of Evil, then against Truman Marsh because he forced the Mighty Avengers to detain innocent Inhumans and force them to wear registration disks.
- Make Me Wanna Shout: Her power is a powerful sonic scream.
Beetle / Mach-IV
Voiced by: Mark Hanson
- Composite Character: He follows the same character arc as the Abe Jenkins Beetle, but his armor comes from the unnamed Latverian Beetle.
- Depending on the Writer: He allegedly is the same Beetle that was in Ultimate Spider-Man, down to having the same design. However, USM Beetle was a Professional Killer and a One-Man Army who was considered as a big threat by SHIELD itself, while this one, like the other Masters of Evil, is depicted as a joke until Zemo steps in.
- Evil Counterpart: To Iron Man with both serving as powered armored members of their teams.
- Mythology Gag: As with Ultimate Spider-Man, the armor he wears in the show itself is based off his outfit from the Ultimate Spider-Man comic.
- Powered Armor: All his powers are derived from wearing one. His suit is even modeled after the one worn by the Ultimate comics Beetle, and is heavily armed.
- The Quiet One: Just like in USM, though he does talk once when alerting everyone about Hawkeye's presence. This changes after he takes on his heroic persona.