Nebula is a character in the Marvel Comics universe, created by writer Roger Stern and artist John Buscema. She first appeared in Avengers #257 in 1985. Nebula is an alien space pirate and assassin who has clashed with numerous Marvel superheroes, particularly the Guardians of the Galaxy.

Nebula's origins are mysterious, but she is known to be a member of the Luphomoids, a race of blue-skinned humanoids from the planet Luphom. She is also the adopted daughter of the intergalactic warlord, Thanos, who has played a prominent role in the Marvel Cinematic Universe. Nebula was originally a loyal lieutenant of Thanos, but later became one of his fiercest enemies.

Nebula possesses numerous superhuman abilities, including enhanced strength, agility, and durability. She is also a skilled fighter, proficient in both armed and unarmed combat, and an expert in various forms of weaponry. Additionally, Nebula has cybernetic enhancements that allow her to interface with technology and possess a variety of abilities, including energy projection and flight.

Nebula has appeared in numerous Marvel comics and has been a prominent antagonist in various storylines, particularly those involving the Guardians of the Galaxy. She has also been featured in several Marvel video games, as well as the Marvel Cinematic Universe, where she is portrayed by actress Karen Gillan.