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"The Black Vortex" is a 2015 comic book storyline published by Marvel Comics involving the all-new X-Men and the Guardians of the Galaxy.

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The Cosmic Cube is a fictional object appearing in American comic books published by Marvel Comics. There are multiple Cubes in the Marvel Universe, all of which are depicted as containment devices that can empower whoever wields them. Although the first version, introduced in Tales of Suspense #79 and created by Stan Lee and Jack Kirby, originated on Earth as a weapon built by Advanced Idea Mechanics, most are of alien origins.

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Captain Universe is a fictional character, a superhero appearing in American comic books published by Marvel Comics. It is the guardian and protector of Eternity. Rather than a character with a single identity, Captain Universe is a persona that has merged with several hosts during its publication history.

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Eternity is a fictional cosmic entity appearing in American comic books published by Marvel Comics. He is the de facto leader of the abstract entities collectively known as the Cosmic Powers of the Marvel Universe.

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Avengers Forever is a twelve-issue comic book limited series published from December 1998 to November 1999 by Marvel Comics. The series was written by Kurt Busiek and Roger Stern and drawn by Carlos Pacheco and Jesus Merino.

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Madelyne Jennifer Pryor is a fictional character appearing in American comic books published by Marvel Comics, primarily featured off-and-on as an antagonist of the X-Men. Originally the love interest and first wife of X-Men leader Cyclops, she became a long-standing member of the X-Men supporting cast, until a series of traumas—being abandoned by her husband, losing her infant son, and discovering that she was a clone of Jean Grey—eventually led to her being manipulated into being a supervillain. She is the mother of Nathan Summers (Cable). Multiple retcons in her publication history and that of Jean Grey have particularly complicated her biography.

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The Celestials are fictional characters appearing in American comic books published by Marvel Comics. They debuted in the Bronze Age of Comic Books and have appeared in Marvel publications for four decades. Their mythology is that they are members of the first lifeforms created in and by the original universe, and have contributed to the creation of the Multiverse present in Marvel Comics, including the evolution of life therein.

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The Infinity Gems are six fictional gems appearing in American comic books published by Marvel Comics, named after and embodying different aspects of existence. The gems can grant whoever wields them various powers in accordance to the aspect of existence they represent, and have the potential of turning the wielder into a god-like being when all six are held together. Thus, they are among the most powerful and sought items in the Marvel Universe; playing important roles in several storylines, in which they were wielded by characters such as Thanos and Adam Warlock. Some of these stories depict additional Infinity Gems or similar objects.

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Nebula is a fictional character appearing in American comic books published by Marvel Comics. Created by Roger Stern and John Buscema, the character first appeared in The Avengers #257. Originally depicted as a supervillain, Nebula was later depicted as an antihero and member of the Guardians of the Galaxy.

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Captain Marvel is a fictional character appearing in American comic books published by Marvel Comics. The character was created by writer-editor Stan Lee and designed by artist Gene Colan and first appeared in Marvel Super-Heroes #12. He is the original bearer of the name "Captain Marvel" within the Marvel brand.

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The Phoenix Force is a fictional entity appearing in American comic books published by Marvel Comics. The entity has bonded with other characters, and often used the alias Phoenix while bonded.

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Galactus is a fictional character appearing in American comic books published by Marvel Comics. Formerly a mortal man, Galactus is a cosmic entity who originally consumed planets to sustain his life force, and serves a functional role in the upkeep of the primary Marvel continuity. Galactus was created by Stan Lee and Jack Kirby and first appeared in the comic book Fantastic Four #48, published in March 1966.

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The Elders of the Universe are a group of supervillains appearing in American comic books published by Marvel Comics. The Collector was the first Elder to appear, and featured in Avengers #28, but the idea that he was a member of a group known as the Elders was not introduced until Avengers #174.

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Quasar is the name of several fictional superheroes in the Marvel Comics universe. They are noted for having worn the Quantum Bands, advanced ancient alien technology that grants the wearer awesome power.