With over eighty years of comic history, MCU fans are never going to see the movie version of every great moment from the original stories, but the battle between Guardians of the Galaxy's Ronan the Accuser and Thanos' lackey Cull Obsidian was always guaranteed not to make it to big screen, owing mainly to the gory conclusion of the fight.
Known as Black Dwarf in the comics, the character the movies call 'Cull Obsidian' has some hidden depths, despite only being introduced in 2013 (by Jonathan Hickman and Jerome Opena.) A member of Thanos' Black Order, the alien powerhouse is a general in the Mad Titan's army, and a surprisingly complex soul who is secretly in love with ally Proxima Midnight. Introduced in 1967's Fantastic Four #65, Ronan the Accuser is an alien antihero — the ultimate form of justice in a society warped by decades of war. While Ronan has threatened Earth on the Kree's behalf many times, he's been a hero as often as a villain, and when Thanos and his Black Order seized Earth, he volunteered to help the Avengers retake it.
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The battle takes place in Avengers #23, from Jonathan Hickman and Leinil Francis Yu, which was part of the Infinity event. Infinity told the story of a two-front alien invasion. When the god-like Builders plotted to destroy Earth and the Avengers journeyed into space to stop them, Thanos saw his chance, attempting to seize the planet while its mightiest protectors were away. However, the planet's remaining heroes managed to hold Thanos and the Black Order at bay, and the Avengers were able to defeat the Builders and return, bringing with them not just the forces of Earth, but a host of alien allies.
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