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In Avengers: Endgame, we see Captain America use

Thor's Hammer, Mjölnir. But not only does he wield it, he also uses Thor's powers of lightning while holding it.

Does this not contradict that

In Thor: Ragnarok, it is explained that the hammer itself is not "the source" of thunder, rather this power comes from Thor himself and the hammer is just a weapon that he can use to control it, but it isn't required.

Therefore, how can Captain America possibly control

thunder by merely wielding Thor's Hammer?

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    Captain America is the God of Hammers. – Adamant Apr 26 at 7:13
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    @Adamant and shields – Dhon Joe Apr 26 at 7:22
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    Comrade, get that man a sickle! – Paul D. Waite Apr 26 at 10:06
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    Thanks for the spoiler tags - in contrast to that other dude who popped up in the HNQ with a possibly spoiling subject. Darn... – AnoE Apr 26 at 12:45
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This is a plot hole as confirmed by one of the writers of the Endgame. Russo brothers knowingly kept the scene to cheer the fans.

From the link:

Avengers: Endgame co-writer Christopher Markus has shed some light on a plot hole from the film regarding Captain America using Thor’s hammer, Mjolnir.

While Cap finally lifting up the iconic hammer was a crowd-pleasing moment, some fans called into question exactly how Cap used it to call down the lightning on Thanos. As we learned in Thor: Ragnarok, the hammer is merely a conduit for Thor’s true power.

“Are you Thor, the God of Hammers? That hammer was to help you control your power, to focus it. It was never your source of strength,” we heard Odin explain to his son.

So if the lightning comes from Thor’s godhood, not the hammer itself, how did Cap summon it? Turns out there’s no good explanation.

“There was certainly a debate at one point because particularly in Ragnarok, it establishes that Thor can summon the lightning without the hammer. I think Odin even says, ‘It was never the hammer.’ And yet Cap summons the lightning with the hammer. You get to those things and you’re like, ‘It’s too awesome not to do it! We’ll talk about it later,’” Markus explained to SlashFilm.

But of course the filmmakers were all on board with breaking the rules if it meant delivering a rousing moment for the audience. Composer Alan Silvestri chimed in with an anecdote on the effectiveness of the moment.

“The thing that Joe and Anthony struggled with, and I think did a magnificent job of solving, was how high do we let the audience get knowing that we’re really going to pull the rug out? That moment when Cap gets the hammer, we were in Westwood on preview night the Thursday night before opening night. When that happened, that place stood on its feet and screamed. It was the biggest reaction in the movie,” Silvestri said. “It was very tempting to give it all away [by using the full Avengers theme at that moment], but what we knew was, we’re about to destroy Cap little by little, and we want everybody to be right there, that this is hopeless because the real moment is the reuniting of all of the Marvel universe to help him. So that was one of those brilliant Joe and Anthony decisions. ‘No, don’t take it. Leave it over there. Resist.’”

The article further clarified why the other answer is wrong:

As some have pointed out in the comments, this may not be a plot hole if you consider the original enchantment Odin put on Mjolnir in the first Thor movie. Odin's word were, "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor." Given that Thor's powers include lightning, it would stand to reason that Cap would gain that power when he wields Mjolnir in Endgame. However, as Markus explains it, Ragnarok changed the rules on how we understand the relationship between Thor and Mjolnir, so perhaps the "power of Thor" only pertains to his godly strength and durability, which Cap clearly demonstrated as he brought the fight to Thanos. Ultimately, Markus' statement paints the picture that Odin's original enchantment does not include Thor's lightning powers, which is why Markus considers it a plot hole.

  • So it turns out I was right! To be honest, it now begs another question: doesn’t Thor Ragnarok’s explanation of Thor’s lightning power contradicts the wording of the enchantment on Mjölnir in the first Thor movie? – Fatalize Nov 6 at 9:51
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    I think Markus is wrong here if the enchantment gives the power of Thor and the lightning doesn’t come from Mjolnir then Steve getting the lightning powers isn’t a plot hole at all, in fact it makes total sense. – TheLethalCarrot Nov 6 at 10:06
  • Cap is using Mjolnir to focus the power as a learning tool the same way Thor used too. – TheLethalCarrot Nov 6 at 10:08
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The wording of the enchantment placed on Mjölnir in the first Thor movie is:

Whosoever holds this hammer, if he be worthy, shall possess the power of Thor.

Which implies that Captain America should have all the powers of Thor as the God of Thunder.

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    Yep this seems to be correct, I was wondering about this as well until I remembered what the enchantment's wording was. – TheLethalCarrot Apr 26 at 8:17
  • Does he channel the power when he is wielding the axe before he swaps it with Thor when Thor says "you use the little one" ? – Mike Apr 26 at 11:57
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    @Mike Even if he does that could easily be part of the power of Stormbreaker. In the comics, Stormbreaker is originally crafted for Beta Ray Bill who continues to have access to thor-like powers despite not using Mjolnir. Even in the films, it can summon the Bifrost so surely it may be within its repertoire to conjure a bit of lightning. – David Coffron Apr 27 at 15:01
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    Also, the Hammer enchantment doesn't seem to have an exclusivity clause. So just because a person worthy enough to swing Mjolnir is doing do, doesn't mean Thor isn't also able to use his power. – Paul Apr 29 at 11:14

protected by Community Apr 30 at 15:33

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