r/MCUTheories is a subreddit with 190k members. The most common flair used is theory, discussion/debate, avengers doomsday, leak, and avengers doomsday discussion.
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
: "Watching Avengers: Endgame Encore has me thinking, what happened to the timeline that 2014 Thanos left to battle the Avengers?"
24 posts
#2
Discussion/Debate
: "I still can’t comprehend how they managed to fumble this concept so badly."
14 posts
#3
Avengers Doomsday
: "The Sentry will force Doctor Doom to relive the death of his mother, Victor's contingency plan for psychics will be revealed to be Mephisto trapped inside his mind!"
14 posts
#4
Leak
: "Major Spoilers for Doomsday (you’ve been warned)"
1 post
#5
Avengers Doomsday Discussion
: "X-Men Timeline for Avengers Doomsday"
1 post
#6
Theory/thought
: "I feel that Doomsday maybe trying to copy Crisis on Infinite Earths' plot"
1 post
#7
Spider-Man: Brand New Day
: "What if MJ boyfriend played by Eman Esfandi is MCU Harry Osborn ?"
1 post
Member Growth in r/MCUTheories
Yearly
+75k members(65.9%)
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Last updated: October 1, 2026