A new fan theory has come up that the serum which turned Steve Rogers into Captain America has a secret connection with Thor.
Fans have tried to connect Captain America’s Super Soldier Serum to Thor’s Mjolnir. This speculation comes from the iconic scene in Avengers: Age of Ultron where Steve Rogers aka Captain America lifts Thor’s hammer slightly.
Chris Evans who plays Steve Rogers is shown as a frail, sickly Army soldier who was given enhanced physical and mental capabilities by the super-soldier serum developed by Dr. Abraham Erskine. That serum helped Steve Rogers transform into Captain America. The serum only worked with Stevie Rogers, all the other experiments failed before or after that.
The theory behind Super-Soldier Serum
In Captain America: The First Avenger, Dr. Erskine first developed a serum while working in the company of Johann Schmidt, the future Red Skull. According to him, the serum required more than just physical attributes to work on someone. Steve Rogers proved to be honorable enough to receive the powers bestowed by the procedure.
There is a theory that Dr. Erskine developed the serum from Asgardian science. The fan theory suggests Dr. Erskine could have discovered the same spell while working for Red Skull. The super-soldier serum with the same spell could have been used on the hammer belonging to Chris Hemsworth’s Thor.
The ingredients of the Super Soldier Serum
It seems like the serum only worked on the person worthy enough, just like the hammer of the Thor. There was a scene in Thor (2011) when Odin banished Chris Hemsworth’s Thor to Earth for his reckless behavior. Moreover, he cast a spell on the hammer to ensure the God of Thunder could only wield Mjolnir once he proved himself worthy.
The worthiness was only known when the person is “Not thinking less of yourself, but thinking of yourself less, that’s what heroes do.” A person who stops thinking of him or herself and fully dedicates their life to helping others.
This was the biggest quality of Captain America. He rocks humility since day one up until Endgame where he finally decides to let himself enjoy life with Peggy. He’s the guy who jumped on a bomb, risked his life to rescue his fellow soldiers, drove a plane into the sea, etc. etc. Just like Captain America, we saw the same thing with Thor.
What Serum did?
The serum did not fail on people. It did exactly what it was designed to do i.e. enhance what is already within. It is Herr Schmidt who has failed at being human. Dr. Erskine figured this out, and he used it on Captain America. He prevented people like the Red Skull from abusing it. This ensured that it could only ever work on people who were worthy of it and would only serve good purpose with it.
The once-villain-turned-stone-guardian was obsessed with the “magic” of the gods. And when he used the serum on himself, it brought out the man inside.
In the movie, Dr. Erskine says, “I am looking for qualities beyond the Physical. The serum was not ready. But more importantly, the man. The serum amplifies everything that is inside. So, good becomes great and bad becomes worse. This is why you were chosen. Because a strong man, who has known power all his life, will lose respect for that power. But a weak man knows the value of strength and knows compassion. “
Captain America and Thor’s Hammer
The grave course of events set in motion by Thanos that wiped out half the universe and fractured the Avengers’ ranks compels the remaining Avengers to take one final stand in Marvel Studios’ grand conclusion to twenty-two films, “Avengers: Endgame.”
When Thor is on the ropes and about to be pummeled by Thanos, his hammer Mjolnir comes whooshing by. But it doesn’t fly into the hand of Thor, instead, it flies into the hand of Captain America (Chris Evans). And that’s where everyone’s mind blows off.

Thor’s magic hammer Mjolnir only comes to those who are worthy. And until now, that has been only Thor. But as Endgame showed, Captain America was as worthy as Thor. And that’s not just because of his Earthly goodness. Rogers has an Asgardian connection which came with the super serum and technically makes him a cousin of the God of Thunder.
