Thanos is the (hidden) and true main antagonist of the Marvel Cinematic Universe. He is a minor character in Guardians of the Galaxy and only mentioned in Guardians of the Galaxy Vol. 2.


For many years, Thanos killed parents and abducted their children for them to be his personal assassins. One he took interest in was Gamora, and Nebula, killing their parents. He had fight his other daughter, Nebula fight each other. However, every time Gamora won, Nebula was replaced with many mechanics for her to be the former's equal.