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Voiced by: Isaac C. Singleton Jr.
The Mad Titan himself.
- Adapted Out: The literal love for Death that serves as his main motivation in the comic isn't present with this version; instead, he appears to be acting only out of megalomania.
- Adaptational Wimp: In the comics, Thanos with the Infinity Gauntlet received the combined attack of Galactus and an army of celestial beings as powerful as him... and completely no sells it. Here, he is severely weakened by the time Arsenal removes his Infinity Gauntlet, plus a mere satellite beam is enough to kill him. However, it took the Avengers everything they had to stop him, and he'll still come back from it.
- A God Am I: He's got the Infinity Gauntlet and enough power to level the entire universe. Not even a Physical God like Thor can compete.
- An Offer You Can't Refuse: He offers to spare Earth in exchange for the Power Stone, but the Avengers don't buy it. However...
- Beware the Honest Ones: Tony describes the Big Bad type as untrustworthy and deny his offer. Thing is, Thanos was pretending to be trapped inside Falcon's containment unit, and made little effort to escape until the Avengers refused his deal, when he could've just broken out and attacked them. Seems Thanos was actually being honest, as shocking as it sounds.
- Brought Down to Badass: Without the Infinity Gems, he's got titan strength that even the Hulk can't compete with.
- The Cameo: At the end of the season one finale.
- The Dreaded: He gives his former lackey Red Skull the shits.
- Evil Laugh: Employs it a lot during his first battle with the Avengers.
- Evil Plan: To collect the Infinity Stones and destroy the universe.
- Evil Sounds Deep: Just like his Marvel Cinematic Universe counterpart. Then again, his voice actor also voiced Sagat and Incognito.
- Fatal Flaw: His big, fat, ego, as evidenced by his use of the Infinity Gauntlet to build statues of himself. When Captain America notices this, the Avengers are quick to cash in on this flaw, which is ultimately Thanos' undoing.
- Final Boss: He is the Avengers' final enemy of the two last episodes of the second season.
- Greater-Scope Villain: Of the show, given the former Big Bad, Skull, is bowing down to him. Later steps down to become the Big Bad of the second season.
- Kick the Dog: Beats down on The Watcher, who, being the Watcher, only watches things unfold and did no harm against the Mad Titan.
- The Juggernaut: NOTHING short of the Power Stone itself did anything to him.
- Last Episode, New Character: For season one.
- Red Baron: Thanos, the Mad Titan.
- Shout-Out: Pretty much any trope about him is one he has in common with his MCU counterpart.
- Villainous Breakdown: When Arsenal counters the infinity stones and takes the gauntlet from him.
Voiced by: Kari Wahlgren
- Amazing Technicolor Population: Just like her comic book counterpart, Proxima has blue colored skin.
- Amazonian Beauty: She has a very muscular yet voluptuous body in addition to being very beautiful.
- Form-Fitting Wardrobe: She wears a costume that highlights her body.
- Homing Projectile: Her spear can follow its targets.
- Male Gaze: She does get subjected to these, but not to the extent of the Black Widow.
- Most Common Super Power: She is very buxom.
- Ms. Fanservice: For an alien, she is quite attractive. She is a tall, beautiful blue skinned alien who wears a very form fitting costume that highlights her muscular body, buxom breasts, toned stomach, and nice legs.
- Statuesque Stunner: She is tall, muscular, and beautiful.
Voiced by: Hynden Walch
- Mind Manipulation: She ensnared Hawkeye's mind, forcing him to attack his teammates.
Voiced by: David Kaye
- Lightning Bruiser: Not only strong, but fast and agile.