Matthew Shepherd with ten A-list stars you probably forgot were in the MCU…
The MCU has employed what feels like half of Hollywood over the past two decades. Most of the time the casting makes sense — a known face in a known role, building toward something larger. But occasionally a genuinely surprising name shows up in a minor part, stays for five minutes, and quietly disappears into franchise history. Some were early-career cameos before the star’s moment arrived. Others were established names taking an unusual swing that didn’t quite land. Either way, they’ve been largely forgotten. Here are ten worth remembering.
Mads Mikkelsen
Mikkelsen played Kaecilius in Doctor Strange (2016) — a former Master of the Mystic Arts who defects to serve Dormammu. On paper this is a role that should have announced him to mainstream audiences as one of the finest actors working. In practice, he was buried under geometric facial makeup and handed a script that gave him almost nothing to do. Marvel’s villain problem was well documented during this era and Kaecilius is one of its clearest examples. Mikkelsen has since become a genuine household name through other franchises. Most people still don’t connect him to Doctor Strange.
Natalie Dormer
Before Game of Thrones made her one of television’s most recognisable faces, Dormer appeared in Captain America: The First Avenger (2011) as a military private named Lorraine. She has roughly one scene — cornering a newly transformed Steve Rogers to thank him for his service and kissing him just as Peggy Carter walks in. It is a blink-and-you-miss-it cameo that landed just before her career took off. Rewatching The First Avenger now produces a genuine double-take.
Glenn Close
James Gunn populated Guardians of the Galaxy (2014) with an eccentric mix of character actors and Hollywood royalty, but Glenn Close might be the most surprising name on the full cast list. She played Nova Prime Irani Rael, leader of the Nova Corps on Xandar, and brought considerably more gravitas to the role than the material required. Then Thanos destroyed Xandar off-screen before Infinity War and the character was never mentioned again. A six-time Oscar nominee as a loose thread in a cosmic franchise is not something you’d predict.
Christopher Eccleston
Eccleston took on Malekith in Thor: The Dark World (2013) — the Dark Elf leader trying to plunge the universe into eternal darkness using the Aether. The production buried him under extensive prosthetics, black contact lenses, and a fabricated alien language, then cut most of his character’s backstory in the edit. Eccleston has been openly critical about his experience on the film, which tells you most of what you need to know. Malekith is consistently cited as the weakest villain in the franchise’s history. Given what they did to one of Britain’s finest character actors, that is not entirely surprising.
Kate Mara
Mara appeared in Iron Man 2 (2010) as a US Marshal, waiting outside Tony Stark’s car to serve him a congressional subpoena. She is on screen for approximately five seconds. This is worth noting primarily because she later starred in Fox’s Fantastic Four reboot — meaning she has now appeared in two separate attempts at Marvel adaptations, one of which nobody remembers and one of which everyone remembers for the wrong reasons.
David Dastmalchian
Dastmalchian played Kurt, the Russian hacker in Scott Lang’s heist crew in Ant-Man (2015). He is genuinely funny in the role, riffing well alongside Michael Peña in a dynamic that the film needed. When Ant-Man and the Wasp: Quantumania moved the action entirely into the Quantum Realm, Kurt and the rest of the street-level crew simply disappeared from the narrative. Dastmalchian has since built a serious career across prestige projects. Most people who’ve seen both wouldn’t connect the two performances.
Sylvester Stallone
Stallone appeared in Guardians of the Galaxy Vol. 2 (2017) as Stakar Ogord, a senior Ravager leader with a long-standing grudge against Yondu. He showed up, delivered his lines with exactly the gruff authority you’d expect, and left. The character returned briefly in later entries without adding much. The main takeaway is that Rocky Balboa technically commands a fleet somewhere in the Marvel universe, which is a sentence that should land harder than it does.
Ty Burrell
Before Modern Family made him one of the most recognisable faces on American television, Burrell played Leonard Samson in The Incredible Hulk (2008) — a psychiatrist dating Betty Ross during Bruce Banner’s exile. In the comics, Samson is a gamma-powered superhero. In the film he wears a sweater and acts as a mild obstacle. Marvel spent the following decade quietly pretending The Incredible Hulk didn’t exist, which erased whatever narrative thread Burrell had been part of entirely. The film’s continued awkward position in MCU continuity is its own strange story.
Justin Theroux
Theroux wrote the screenplay for Iron Man 2, which is his primary Marvel connection and the more interesting one. He also managed to place himself on camera during the film as a police officer escorting Gwyneth Paltrow’s Pepper Potts. He is visible for a matter of seconds in what is a production in-joke that most audiences missed entirely, which was presumably the point.
Matt Damon
In Thor: Ragnarok (2017), Taika Waititi included an early scene on Asgard in which actors perform a theatrical recreation of Loki’s supposed death from the previous film. Matt Damon, uncredited, plays the Asgardian actor playing Loki — in a wig, in full costume, delivering an aggressively dramatic performance of a fictional death. He commits to it completely. Because he is unrecognisable under the costume and the joke moves quickly, most audiences missed it on first viewing. It is one of the better hidden cameos in the franchise and Damon’s willingness to do it at all says something about how seriously Waititi was taken by that point.
The through line across all ten is that the franchise’s sheer scale inevitably swallows performances that would be significant anywhere else. A Glenn Close or a Mads Mikkelsen disappearing into minor roles is only possible in something this large. Whether that’s a feature or a flaw probably depends on which side of the casting decision you’re on.
Matthew Shepherd
