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Looking at the Avengers’ first two years of existence, here is a breakdown of the first 10 villains they fought, based on power levels.
10) Kallusians

In Avengers #14, the team was in a panic. In the previous issue, Wasp almost died when the Avengers battled Count Nefaria, and the Avengers rushed her to the hospital for help. However, there was nothing that could be done there, so they set out to find Dr. Svenson because his experiments in lung restoration could help Janet. What they found was an alien pretending to be the doctor, and they realized there was an entire alien army hiding on Earth known as the Kallusians. The two sides fought, but the Kallusians ended up running away when a second alien race found them, and the two sides were in a war. They were just a roadblock to finding Svenson, and disappeared quickly so the doctor could save Wasp’s life.
9) Commissar

The 10th different villain that the Avengers ever fought didn’t show up until Avengers #18. By this time, every original Avengers member had quit the team, and Captain America now led the team with Hawkeye, Black Widow, Scarlet Witch, and Quicksilver as his teammates. In this issue, the Avengers head into a communist state called Sin-Cong and end up battling their leader, a cruel man known as Commissar. It made no sense how the Avengers could take action in a foreign country, but they learned that Commissar was a robot, beat him, and liberated the country.
8) Space Phantom

After the big battle in the first issue that brought the Avengers together, they ended up in a very disappointing battle in Avengers #2. The second-ever villain the team fought was a man known as the Space Phantom. He was a shape-shifter who pretended to be Hulk, Wasp, Giant-Man (Ant-Man changed to Giant-Man in this issue), and Iron Man at different times. He had some decent powers because he could take the form and powers of mortals, but he made a mistake when he tried it on Thor. Since Thor is a God, it backfired, and Space Phantom was blasted into limbo. He returned a few times after this, but was never a memorable villain.
7) Lava Men

Avengers #5 had the team battle the Lava Men, beings who had previously appeared in Journey Into Mystery, where they battled Thor. These creatures live in Subterranea and are made of living lava, so they are clearly very powerful beings, as they can generate heat from their bodies and increase it at will. The thing about these beings is that not all of them want to attack and don’t consider the humans evil, and it is mainly a tich doctor named Jinku, the Lava Man witch doctor. That said, the battle was short, although the Lava Men more than held their own, but it was all about saving both their world and the surface world, and Hank Pym found a way trick Hulk into causing the rock to implode and save both societies, ending their battle.
6) Mole Man

The Avengers also battled the Fantastic Four’s first enemy not once, but twice in their first two years. The team battled the Mole Man for the first time in Avengers #12, where he captures Giant-Man, and the Avengers have to take the battle to his underground base, where they also find the Red Ghost. Mole Man was then back in Avengers #17, and he proved how dangerous he was because he brought backup with him, including the Minotaur, a servant of the Mole Man and a monster who was too powerful for the new Avengers team under Captain America to beat without all working together as a unit.













