While Thanos was the MCU's first big bad villain, he'd likely come up short against DC's own heavyweight, Darkseid, leaving the MCU with few options capable of matching the DC villain–save for one. Both Thanos and Darkseid are massively powerful, cosmic villains who've endured in the comics as among the most dangerous foes the Avengers and Justice League have ever faced, respectively. However, for as long as the debate regarding the power tiers of the two inescapably similar characters may go, the MCU may have already introduced a character that's an even better match for Darkseid than the Mad Titan.
The debate was revived upon the eventual release of Zack Snyder's Justice League, which featured a flashback sequence of Darkseid battling a combined force of Old Gods, Atlanteans, Amazons, including Artemis, and more on Earth, ultimately being driven back. At least where the cinematic universes are concerned, everything suggests a clash between the two would go to Darkseid. However, another MCU villain — one introduced in a rather unlikely place — might stand a better chance.
Related: Infinity War Theory Reveals Thor Deliberately Lost To Thanos At The Beginning
Marvel What If...?'s final three episodes introduced the concept of Infinity Ultron — a version of the homicidal android from the second film in the Avengers franchise who succeeded in getting his enhanced body. Infinity Ultron would likely fare far better, as the android killed Thanos immediately upon his arrival and took the remaining five Infinity Stones, becoming a being quite possibly on par with Justice League's Darkseid himself.
It's no secret that Thanos was created in the image of Darkseid. The Mad Titan made his debut in Invincible Iron Man #55 (1973),
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