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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. It first appeared in the Marvel Universe in Tales of Suspense #79 and was created by Stan Lee and Jack Kirby.

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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 "Maddie" 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 a group of fictional characters appearing in American comic books published by Marvel Comics. Immensely powerful and of huge humanoid shape, the Celestials are some of the oldest entities in the Marvel Comics universe. They debuted in the Bronze Age of Comic Books and have appeared in Marvel publications for four decades.

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The Infinity Gems are six gems appearing in Marvel Comics. The six gems are the Mind, Power, Reality, Soul, Space, and Time Gems. The Gems have been used by various characters in the Marvel Universe.

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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.

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Captain Marvel is a fictional superhero 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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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.