10 Most Nonsensical Plot Holes In The MCU
5. Cap Can't Possibly Return The Stones
At the end of Avengers: Endgame, Captain America leaves 2023 with 2014’s Mjolnir and a case full of Infinity Stones, intending to return them all to the timelines that they were stolen from.
Now you have to assume that Cap's quantum GPS wristwatch gadget had all the necessary journeys keyed into it, and that Cap had enough Pym Particles to make all of those journeys without running out of gas at any point. That’s a given, or the whole mission would be hopeless.
The thing is, well… the mission is pretty much hopeless anyway. The original Time Heist took several teams of superheroes to pull off, of which Cap was only one. How did he expect to do it on his own - sneak the Sceptre back to Hydra or return the Orb to the laser-protected vault on the planet Morag?
Even if your answer to that question is something like "because he's Captain America", he doesn't have the Orb or the Sceptre - or the Tesseract for that matter. He has no way of transforming the Reality Stone back into its gloopy Aether form.
He also doesn't have a way of getting to Vormir. Black Widow and Hawkeye travelled there from Morag on the Benetar, the Guardians' ship, which had been shrunk down to pocket size. By the time Cap makes the trip, the Guardians had the Benetar back.
Imagining this as an awesome untold Captain America adventure is one thing - what happened when he met the Stonekeeper version of the Red Skull? cooooool - but the film simply doesn't give him the tools he needs to even come close to completing the mission.