7 Avengers: Endgame Plot Holes Doomsday Can't Ignore, Ranked

Endgame did a lot of heroic heavy lifting, but it also left a trail of head-scratchers the size of a Leviathan. Some of them are charming shrugs; a few are structural cracks. If Marvel really is steering toward Avengers: Doomsday, that movie has a chance to patch the messiest seams. Here are the biggest Endgame problems that still bug me — ranked from least to most broken — and the comic-booky ways Doomsday and a certain tyrant in green could clean them up.

'Out of 14,000,605 possible futures, there was only one where we win.'

The 7 Endgame snags that need a cleanup job

1. Where did Ant-Man get all those Pym Particles?
   Endgame makes a big point out of Pym Particles being scarce. Scott pops out of the Quantum Realm (shoutout to the universe's most important rat), the team has just enough juice for a limited number of time jumps, and every test run is treated like cracking a safe. Cool. Then the final battle happens and Ant-Man goes kaiju multiple times. Size-changing also burns Pym Particles, so... where did that stash come from when the time heist math was so tight?

   How Doomsday could fix it: If Doctor Doom shows up as the resident terrifying genius, one tidy retcon is that Doom cracked large-scale Pym Particle synthesis earlier than anyone knew, making them reasonably accessible in the Sacred Timeline for suit use, while time navigation still required specialized vials. Not infinite, but not 'one round-trip for the whole class' either.

2. How did Steve return the Tesseract as a Tesseract?
   The Space Stone lives inside the Tesseract. To use the Stone, the cube gets cracked open. Endgame has Cap jump to 1970 to put the Space Stone back with S.H.I.E.L.D., but what S.H.I.E.L.D. later has is the cube, not a loose blue rock. Did Steve... re-cube it?

   How Doomsday could fix it: A very Marvel solution would be Doom explaining that the Stones have a kind of self-correcting behavior along the Sacred Timeline. In plain English: the Space Stone 're-manifested' as the Tesseract because that is the form it is supposed to take at that point in history.

3. Captain Marvel just happens to find Tony and Nebula in deep space?
   After Titan, Tony and Nebula limp away on Peter Quill's Milano, which is out of fuel, has no working comms, and is running out of oxygen. Space is, last I checked, very big. Carol Danvers finding that needle in that haystack isn't just lucky — it's lottery numbers on a lightning strike lucky.

   How Doomsday could fix it: The MCU has already teased 'cosmic beacons' — Eternals name-dropped ancient signals, and the Shang-Chi mid-credits scene turns the Ten Rings into a deep-space ping. Doom could connect those dots: Carol triangulates an active beacon, not blind luck. It's tidy, and it uses tech the franchise already seeded.

4. Thanos time-travels an entire armada with one vial
   Endgame sets a clear rule: one Pym Particle vial equals one round trip for one traveler. 2014 Thanos then jumps to 2023 with a city-sized ship, a swarm of Outriders, and the works — all off a single vial lifted from a captured Nebula. That is not how the movie told us the rules work.

   How Doomsday could fix it: Fold it into the Multiverse mess. Doom could label that stunt a 'micro-incursion' — an oversized payload forcing a tear between timelines — which would also help explain why the Multiverse is unstable afterward. If Thanos punched a hole to drag his warship through, the bill comes due later.

5. Doctor Strange's plan kind of hinges on... a rat
   In Infinity War, Strange runs 14,000,605 scenarios and finds one winner, then gives Thanos the Time Stone. That 'one path' ends up requiring a random rat to step on just the right buttons to free Scott Lang from the Quantum Realm. Brave plan. Also, absolutely deranged.

   How Doomsday could fix it: Reframe it. Doom could argue Strange wasn't betting on 'the rat outcome' so much as engineering conditions for a specific person or event to emerge on Earth-616 — something bigger than the victory itself. That shifts the cosmic math from 'lucky vermin' to 'multiversal gambit' and makes Strange's calm a lot less absurd.

6. Why is 2014 Gamora still around?
   The Gamora we know dies on Vormir in Infinity War. Endgame brings in a 2014 Gamora who ultimately helps the good guys. When Tony snaps Thanos and his invading army into confetti, that variant Gamora does not vanish with them. If the TVA exists to prune timeline anomalies (thanks, Loki), shouldn't a displaced Gamora trigger an alarm?

   How Doomsday could fix it: Doom could position 2014 Gamora as the first major 'glitch' that starts the decay of Earth-616's reality, paving the runway to an incursion. It's dark, it explains the TVA's apparent blind spot, and it gives weight to her survival beyond 'Peter needs closure.'

7. Old Man Steve and the bench paradox
   The big one. Cap goes back to return the Stones and decides to stay with Peggy. Then he shows up as an old man on a bench to pass the shield to Sam. Two issues: 1) if he stayed in a branch timeline, how did he hop back to that specific bench without the time platform, and 2) if he lived through the main timeline, he watched HYDRA rot S.H.I.E.L.D. from the inside, saw Bucky assassinate the Starks, and kept quiet?

   How Doomsday could fix it: Fans have a spicy theory that a Tony Stark in that branch timeline mutates into a Doom-Stark figure thanks to the instability of having two Steves in play, eventually chasing our Steve back to Earth-616. It turns a continuity riddle into an origin story vector for Doom. Messy? Yep. But it beats 'Cap took the long way around and no one noticed.'

The basics, for context

'Avengers: Endgame' was directed by Joe and Anthony Russo, released April 26, 2019, and made about $2.7 billion worldwide. It sits at 8.4/10 on IMDb and 94% on Rotten Tomatoes. Marvel Studios produced it, and you can stream it on Disney+.

Cast roll call: Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Don Cheadle, Paul Rudd, Brie Larson, Karen Gillan, Danai Gurira, Benedict Wong, Jon Favreau, Bradley Cooper, Gwyneth Paltrow, and Josh Brolin.

If Marvel wants to answer any of this on screen, 'Avengers: Doomsday' is positioned to do it. The movie is slated for December 18, 2026 in the U.S. I have theories; you probably do too. Drop yours in the comments — which plot hole do you want fixed most, and how weird are you willing to let Marvel get to make it work?