Adam Warlock

Adam Warlock is a member of the Guardians of the Galaxy. He possesses the soul gem on his forehead, which allows him to speak telepathically with others. He is voiced by Kirk Thornton.

The Avengers: Earth's Mightiest Heroes
Adam Warlock arrives to Earth with the other guardians looking for Michael Korvac. In their search, the Guardians had to fight with the Avengers because they believed that the Guardians had been responsible for the Korvac's kidnapping.

The battle was stopped at the request of Hawkeye, Star-Lord finally explain who really is Korvac. Later, the Avengers and the Guardians joined forces to stop Michael Korvac but Korvac was too powerful and defeats them.

After Korvac departed to another dimension, Warlock explains that the Corrina's words caused the departure of Korvac, then Warlock and his teammates left the Earth.

Trivia

 * A large green cocoon can be seen inside the Collector's Museum in Thor: The Dark World and Guardians of the Galaxy. In a interview director James Gunn later confirmed that cocoon does indeed contain Adam Warlock.