r/MCUTheories is a subreddit with 195k members. The most common flair used is theory, avengers doomsday, discussion/debate, visionquest, and avengers secret wars.
The place to drop your theories about the MCU. Spoilers are allowed but please tag them as such.
Flair Used in r/MCUTheories
#1
Theory
: "Ultron was based on Tony Stark himself? And what if that’s the clue to Doctor Doom?"
20 posts
#2
Avengers Doomsday
: "Miles Morales might be introduced into the main MCU universe through Tobey's Spider-Man."
17 posts
#3
Discussion/Debate
: "Hottake: This is Ultrons best look thus far and I would love to see it be used in Doomsday without the stones"
13 posts
#4
VisionQuest
: "I'm still waiting for the guy from Iron Man 1 to show up in Vision TV show , what is he's going to do and why is he's in VisionQuest ?."
5 posts
#5
Avengers Secret Wars
: "What will Peter Parker's (mcu) role be in Secret Wars? I think he will be the main character of the film"
4 posts
#6
Agatha All Along
: "Great nod to Pops"
1 post
#7
Spider-Man: Brand New Day
: "A side effect of being on this sub is just how often I jump to the most convoluted explanation when there's something much simpler going on"
1 post
#8
Leak
: "No need for theories when we already have it"
1 post
#9
Poll
: "Which MCU mystery piques your interest the most?"
1 post
Member Growth in r/MCUTheories
Yearly
+78k members(66.9%)
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Last updated: October 25, 2026