History
Karnak was a member of the Inhuman Royal Family. When Maximus attacked Avengers Academy, he brainwashed most of the Royal Family, including Karnak.
Later on, Gorgon was freed of the mind-control and Triton was freed from his cell. Soon after, Karnak was freed from his own mind-control. Reunited with his brother, Karnak helped the Avengers fight Maximus.[1]