Avengers: Endgame officially confirmed that Captain America is worthy of wielding the mighty, mystical Mjolnir but the film didn't explain why it took so long for the Star-Spangled Avenger to summon the hammer, particularly when he had the opportunity to do just that back in Avengers: Age of Ultron. Thanks to new intel from the masterminds behind the biggest film of all time, we finally know why Cap didn't lift Mjolnir until Endgame.
During an Ask Me Anything session on Reddit, the Russo Brothers fielded a question about Captain America's ability to wield Mjolnir, the square-headed sledgehammer only able to be utilized by those the Asgardian gods believe is worthy.
Its most famous user is, of course, the Asgardian God of Thunder Thor. Audiences got the first hint that Captain America would be worthy of wielding the weapon in Age of Ultron, when Thor invited the rest of the Avengers to try their hand at lifting Mjolnir. When Steve Rogers stepped up to the plate, he was able to shift the hammer slightly, unlike the rest of the crew, who couldn't even make it budge. This caused Thor to perk up in his seat and look visibly concerned that Steve would genuinely end up swinging Mjolnir through the air.
In Endgame, when Captain America summons Mjolnir during the intense final battle against Thanos, "Bro Thor" is totally pumped:
This suggested that the God of Thunder had known for years that Cap was worthy of wielding the hammer likely recognizing that fact way back in Age of Ultron. It subsequently caused many, including one curious Reddit user, to wonder whether Captain America could always wield Mjolnir, and was thus able to lift it in Age of Ultron and simply decided not to, or if he accrued worthiness over time.
Anthony Russo explained on Reddit that, in his interpretation, Captain America "always could" pick up Mjolnir, and realized that during the party at Stark's place in Age of Ultron. Anthony wrote,
"Our interpretation of the famous scene in Ultron was that when he realized he could pick up Mjolnir he quickly chose not to, because he didn't want to embarrass Thor." Keep watching the video to learn why Cap didn't lift Mjolnir in Age of Ultron!
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