Random Characters You Didn't Know Appeared In The Marvel Cinematic Universe (31 items)

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(#11) Eternals

The Eternals are basically as close to gods as terrestrial beings come, as far above mutants or Inhumans as those groups are to normal human beings. Despite this awesome power, the Eternals exist in the otherwise grounded MCU, even if they’ve never been mentioned by name.

The Celestials (who appeared in Guardians of the Galaxy) created the Eternals when mankind was still evolving opposable thumbs. The Inhumans (established in Agents of SHIELD) were created by the alien Kree as an attempt to imitate the Eternals’ powers, and Thanos (who grinned his way into The Avengers) is an Eternal himself, albeit born mutated and deformed by their standards.

In fact, Drax was originally empowered by the Eternals to kill Thanos. Basically, the Eternals exist in the MCU because everything around them exists in the MCU.
(#23) Manifold

Eden Fesi was Nick Fury’s ace in the hole. While the Fury spent decades deceiving his enemies, he also secretly monitored and trained his own superhuman agents in case anything should go wrong. His elite agents were the Secret Warriors, and his most secretest warrior was Eden, codename: Manifold.
With the ability to fold space and open portals to anywhere in the universe, Manifold became a key part of Fury’s War, and a vital member of the Avengers. He exists in the MCU as well, as the third season Agents of SHIELD episode “The Inside Man” established him as “Subject SW4-7-2009” (a reference to his first appearance, Secret Warriors #4, July 2009). He was captured by anti-Inhuman forces and freed by SHIELD.
(#1) Alpha Primitives

The Inhumans trace their history back before ordinary humans had figured out farming and permanent settlements. But even with all that societal experience, they aren’t above mistakes. Case in point: The Inhumans created their own slave race. The Alpha Primitives were bred to be strong and docile, but in recent years they’ve yearned for freedom and their own place in Inhuman culture.
This unfortunate aspect of Inhuman society made it into the MCU with the Agents of SHIELD Season 3 episode “Emancipation,” when an Inhuman leader forced scientist Holden Radcliffe to experiment on humans as part of his “Alpha Test.” The end result were powerful but mindlessly obedient “Primitives.” Oh and the episode’s title? Horribly ironic.
(#12) Doctor Faustus

One of Captain America’s most terrifying enemies cuts a fairly unassuming figure. On the surface, Doctor Faustus is just a tall, overweight man with a bushy red beard. The evil psychologist, however, has repeatedly engineered tremendous tragedies for Cap, from (temporarily) driving Peggy Carter insane to convincing Cap’s modern-day love Sharon Carter to assassinate him.
In the MCU, Faustus, aka Johann Fennhoff, was recruited into Hydra after battling Peggy Carter in the first season of Agent Carter, and his “Faustus Method” of memory manipulation, post-hypnotic suggestion, and mind control was used by Hydra to maintain operatives, plant sleeper agents, and even manipulate Captain America's childhood friend Bucky Barnes (AKA the Winter Soldier).
(#25) Ultimo

One of Iron Man’s oldest villains is Ultimo, the Living Holocaust. That unfortunate epithet aside, Ultimo is a giant alien robot of destruction that never goes down without doing millions in property damage first. This towering engine of death exists in the MCU – but only in the tie-in comic book.
That’s right, Ultimo premiered in the comic inspired by the movie based on the comic book. In Captain America: Road to War #1 (which takes place right before the start of Captain America: Civil War) readers see Cap training the new Avengers team while Tony Stark builds his watch/glove thing we see him use in the film against Winter Soldier.
As this takes place after Avengers: The Age of Ultron, there are Hydra remnants (presumably working for Grant Ward, given what was happening in Agents of SHIELD at the time) who repurpose Ultron drones for their Project: Ultimo. The subsequent giant robot is the first test for Cap’s kooky sextet. Sadly, Iron Man does not actually fight his comic book nemesis. Too busy with combat horology, apparently.