In Avengers: Endgame, fans saw Iron Man caution about the perils of time travel. Kang’s return to the MCU certainly promises to deliver the reward for that warning. As a Kang variant in Loki, Jonathan Majors is confirmed to return in Ant-Man and the Wasp: Quantumania in 2023.
However, it is unknown whether he’ll make a cameo sooner or later. Numerous Marvel Cinematic Universe shows and films have aired since Avengers: Endgame. Nonetheless, one crucial phrase from Tony Stark will have a larger payout in the future.
Returning in Avengers: Endgame, Ant-Man has a plan for how to time-travel to make things right. The group established the notion that time travel may have unforeseen effects. This was done by making many references to films that include time travel elements.
By using Tony Stark’s last key, the Avengers accidentally enable Thanos to return and try to re-enact the Snap. The destruction of the Avengers’ base by Thanos’ the Sanctuary II, signals his approach. After the event, a befuddled Steve Rogers asks Tony Stark, “What happened?” and Tony’s response is, “You messed with time. It tends to mess back. You’ll see.
The use of time travel by Iron Man put in motion events much greater than those shown in Avengers: Endgame. Because of their time heist to 2012, the Loki that appears in Loki helped Sylvie find Kang. One such variant of Kang who did so is also known as “He Who Remains”.
Iron Man’s innovation and warning are directly responsible for Kang’s murder at the hands of Sylvie in the Loki finale. After Kang’s death, the multiverse is born. Following this, the reality-hopping, time-traveling Kang variants will play a key role in the MCU’s Phase 4 and perhaps beyond emerging as a result. Because Loki and Sylvie tampered with time in such a major way, it is now resetting itself in an appropriate manner.
While it’s easy to see Iron Man’s statement as a premonition of his demise after deploying the Infinity Stones to take down Thanos, it’s actually a precursor for a bigger, more direct reaction. If Tony Stark says this phrase after Thanos has already come, his forewarning of that catastrophe will have been at the very least a bit off. Many characters had previously shown that time travel may have unforeseen effects. In fact, the “you’ll see” part of his statement indicates future and more catastrophic ramifications for the universe than his own demise.
The reappearance of Thanos in Avengers: Endgame was unavoidable. However, Loki’s activities, which Iron Man allowed and which will lead to the appearance of Kang variants, promise to be a much larger disaster. Even though he was a good guy in the Marvel Cinematic Universe, Iron Man created a lot of bad guys by trying to uphold the moral arc. It’s only appropriate that the man responsible for launching the Marvel Cinematic Universe with Iron Man will continue to have an impact on the direction of the MCU even after his passing.