A Kree radical, Ronan continues to fight an ancient war between his people and the Xandarians. Ronan has struck a bargain with the Machiavellian Thanos — retrieve a mysterious artifact known as Universal Weapon or the Orb, and in exchange Xandar will finally be eradicated in revenge for the murder of his father and grandfather. Tasked by Thanos to train Gamora and Nebula into assassins, they eventually became Ronan's servants too.
During his search for the cataclysmic Orb, Ronan and his forces commited unspeakable genocides and murders, including the murder of the entire family of Drax the Destroyer, and, according to Drax, he laughed.
Guardians of the Galaxy
During a few years of Ronan's reign of terror, the Orb was found and stolen by Peter Quill (also known as the Star Lord). Ronan, angry wants the stone and sends Gamora, a gotg member, after it. But she planned to betray Ronan and give it to the collector. On board his starship, the Dark Aster, Ronan learns of Gamora's betrayal and the loss of the Orb and is summoned to Thanos' Domain to discuss it with him.
Later, Drax summons Ronan to a bar at Knowhere, determined to get his revenge against him for slaying his family. Ronan searches for the Orb and sees Gamora escaping with it in a pod. He sends Nebula to retrieve it while he deals with Drax. During their battle, Ronan says he does not recall killing his family, but it mattered little to him as he "will not recall killing him" either. He easily defeats Drax as the Guardians of the Galaxy escape, but Nebula blasts Gamora's pod, destroying it, but leaving her to die in space while she finally retrieves the Orb and delievers it to Ronan.
He gets the stone but instead of giving it to Thanos. He keeps it for himself and tries to destroy Xandar. But he gets destroyed by the guardians of the galaxy.
◾Due to the Skrulls being owned by Fox, the Xanderians may be their replacements in the Marvel Cinematic Universe.
◾Lee Pace tried out for the role of Star-Lord, but it went to Chris Pratt.
◾His role may be monstrous and psychotic.
◾He was asked by Thanos to train Gamora and Nebula into assassins