🚨WARNING: Spoilers ahead, Do not read on unless you have watched What If…? Episode 8 titled “What If… Ultron Won?”.🚨
When Clint Barton is fighting Ultron’s robots, he has a neat invisibility cloak which is a first in Marvel. Previously this tech has been used by S.H.I.E.L.D. to hide their aircraft in the sky.
In 2013’s Age of Ultron comic books, many of the prominent heroes die except Barton and Natasha. This episode is similar to the plotline of those comics.
Tony’s idea of putting a suit of armor around the world comes straight from Avengers: Age of Ultron.
In What If… episode 8, when Vision is being created, Natasha can be seen standing with the other Avengers. However, in Age of Ultron, she wasn’t there because she was captured.
Another episode, another death. Tony Stark once again dies which further proves that his death is an “absolute point in time”. It’s is simply unchangeable and unmovable, no matter what the timeline is.
This episode gives us a quick cameo of General Thaddeus Ross when The Watcher was giving us a backdrop of how Ultron gained control. General Ross has previously been seen in The Incredible Hulk, Captain America: Civil War, Avengers: Infinity War, Avengers: Endgame, and Black Widow.
Ultron splitting Thanos in half seemed like a callback to Thanos’s purpose of getting rid of half of all life.
When Ultron pays a visit to Sovereign in order to wipe out signs of life, you can spot Guardians of the Galaxy on that planet doing the same mission that they had in the beginning of Guardians of the Galaxy Vol. 2.
When Captain Marvel pops up on Nova Corp to stop Ultron, she refers to him as “Skynet” and even talks about a killer robot movie, which are both callbacks to The Terminator.
Barton asks Romanoff if she’s ever watched Raiders of the Lost Ark as they were walking through the archive room. He made that reference because this moment has similar visuals of the Ark getting taken to a warehouse.
In one of the boxes, Natasha finds Alexei’s Red Guardian shield from Black Widow.
It’s possible that Natasha’s chosen family also existed in this universe as she was seen trying to use humor to cover up her feelings about finding Alexei’s shield.
Clint Barton makes a Star Wars: A New Hope reference while on his hunt for Zola’s file inside the warehouse.
Nat and Clint locate Zola in the same facility in Siberia where we saw Bucky and Steve tracking down Zemo in Captain America: Civil War.
Zola quotes Clint’s middle name as “Francis,” which comes directly from the Marvel comic books.
The visuals of Clint’s death at the hands of Ultron’s robots are mirrored to Natasha’s death on Vormir in Avengers: Endgame.
Natasha does her signature landing pose using Red Guardian’s shield in What If… episode 8.
When Ultron went hand-to-hand with The Watcher, he takes up a bite of the whole universe. If there’s anyone who has ever done something similar, it’s Galactus from the comic books, who is literally known as the Devourer of Worlds.
In one of the universes where Ultron and The Watcher crash into, you can see Steve Rogers being sworn in as president of the United States.
The pineapple-shirt guy who was spotted in What If…? Episode 7, makes an appearance in this episode too.