Nebula is a cosmic character from Marvel Comics, originally created by writer Roger Stern and artist John Buscema. Making her debut in "The Avengers" #257 in 1985, she is introduced as a space pirate and the adopted daughter of the Mad Titan Thanos. Nebula's origin ties back to her attempts to gain her father's approval while battling her insecurities and search for her identity. Often depicted as ruthless and cunning, she seeks revenge on those who have wronged her, including her sister Gamora. Over the years, her character evolves from a mere villain to a more complex figure, struggling with her past and seeking redemption. In recent story arcs, particularly in the "Infinity Gauntlet" series, she battles other cosmic entities, becoming a key player in major events of the Marvel universe. The portrayal of Nebula in the Marvel Cinematic Universe, where she is played by Karen Gillan, further popularizes her character, showcasing her arc of transformation from villain to ally with the Guardians of the Galaxy. Nebula’s themes of individuality, betrayal, and familial conflict resonate deeply with audiences, making her one of the most intriguing characters in Marvel lore.