Michael Korvac

The Avengers:Earth's Mightiest Heroes
Once he was a calm and normal man, but now he was a madman because of the unstable cosmic powers the Kree experimented on him. He still believes that the Kree are coming after him and is not going to trust anyone, except for Corrina, the woman he loves.

After hearing Corrina's sad yet angry words, he lost his will to fight as he banished himself to the other parts of space where he blames himself for all the things he done.

The Avengers:Earth's Mightiest Heroes
Before being abuducted and experimented on by the Kree, he wears a normal civilain attire. In the present, he only wears his pants.

In his human form, he looks skinny and weak and in his cosmic form, he glows with yellow cosmic energy with muscles and spiky hair.

The Avengers: Earth's Mightiest Heroes
Korvac was a normal human, until whilst driving through a mountain area when he was taken by the Kree, and experimented with him for a long time, which gave Korvac incredible destructive powers, which he used to destroy the Kree ship and escape. Korvac then used his power to destroy other things; a space-station, an inhabited planet, etc. enjoying it, and returned to Earth.

The Guardians of the Galaxy try to catch him, but couldn't with his powers.

He landed in Central Park, creating a crater, claiming to being pursued by aliens. The police take him to the Avengers. After Waspbrought his wife, Corrina Walters, to the Avengers Mansion to be with him, the Guardians of the Galaxy appeared in search of Korvac.

Hearing Michael Korvac's pleas, the Avengers fought the Guardians as Michael escaped along Wasp and Corrina. When the Guardians explained to the Avengers the threat Korvac represented to the universe, his powers manifested and he knocked out everyone in the scene but Corrina. He escaped with her and a unconscious Ms. Marvel who he knocked out in battle.

Within Adam Warlock's Soul Gem, the Guardians made the Avengers aware of Michael Korvac's true story. After that, both teams worked together to take him down for good. He arrived in Central Park and continued to battle Ms. Marvel under the reason to protect Corrina. When the Avengers and the Guardians arrived, he fought them, but even with their combined powers, Korvac easily defeated them in front of Corrina's eyes. He tried to explain to her that he was only doing that to drive away the "monsters" from them, but Corrina replied in saying: "You're the only monster here, Michael!"

Korvac then teleported himself to the deep space, possibly to another dimension, blaming himself for all the things he had done.

Ultimate Spider-Man
Korvac was an intergalactic warlord who lead the  Chitauri  in their conquest. Taking notice of the powerful figures on the planet  Earth, including  the Avengers ,  Fantastic Four , and  Doctor Strange , Korvac set out to destroy the planet before those heroes had a chance to stop him. The  Guardians of the Galaxy, with the help of  Nova  and  Spider-Man , were able to stop his diabolical plan, destroy his flagship, and kill Korvac in the process, putting an end to his reign of terror.

The Avengers: Earth's Mightiest Heroes
Michael Korvac possess very unstable cosmic powers that causes him mental instability. With those at his disposal, he can do anything he wants whenever he wants to do.