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.
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.
The Fantastic Four is an independent superhero film completed in 1994.
 Executive produced by low-budget specialist Roger Corman and Bernd Eichinger (who went on to produce a big-budget "Fantastic Four" film in 2005), the film was based on Marvel Comics' long-running comic book and featured the origin of the Fantastic Four and that superhero team's first battle with the evil Doctor Doom, combining the superteam's origin from "The Fantastic Four" #1 and Doom's origin from "Fantastic Four Annual" #2 with original elements.
 Despite a tentative scheduled 1994 release date, the film was ultimately never released officially, but illegal copies began circulating after a few years.
Anti-matter Man is a fictional cosmic entity of the DC Comics universe.
 He first appeared in Justice League of America # 46 (October 1966).
Fantastic Four vs. the X-Men (also known as X-Men vs Fantastic Four) is a four-issue comic book limited series published by Marvel Comics in 1987.
 Written by longtime "Uncanny X-Men" writer Chris Claremont, pencilled by Jon Bogdanove, and inked by Terry Austin, the series revolves around the quest to find an effective medical treatment for Kitty Pryde.
 Along the way, the Fantastic Four and the X-Men come into conflict with each other, and what appears to be a sinister secret regarding the Fantastic Four's origin comes to light.
The Beyonder is a fictional cosmic entity appearing in American comic books published by Marvel Comics.
 Created by writer Jim Shooter and artist Mike Zeck, the Beyonder first appeared in "Secret Wars" #1 (May 1984) as an unseen, nearly omnipotent being who kidnapped the heroes and villains of the Marvel Universe and had them do battle on another planet called Battleworld.
 He later appeared in a more antagonistic role in the 1985 sequel "Secret Wars II", in which he took human form, and threatened to destroy the Marvel multiverse.
 Although he first took on a physical, humanoid form in "Secret Wars II" #2, it was in "Secret Wars II" #3 that he took on the permanent form in which he remained for the rest of his existence, that of a Caucasian human male with curly black hair.
 Although the character met his demise at the end of "Secret Wars II", he has subsequently appeared in stories well into the 2000s, although in greatly diminished form.
The Living Tribunal is a fictional cosmic entity appearing in American comic books published by Marvel Comics.
 The character first appeared in "Strange Tales" #157 (June 1967) and was created by Stan Lee, Marie Severin, and Herb Trimpe.
Superman/Fantastic Four, subtitled "The Infinite Destruction," is an intercompany comic book jointly published by DC Comics and Marvel Comics in July 1999.
 The tale unites DC's first superhero Superman and Marvel's first superhero team, the Fantastic Four—pitting them against the Cyborg Superman (who gained notoriety in 1993 during DC's "Reign of the Supermen" story arc) and the longtime FF foe Galactus.
Fantastic Four Adventures is part of Marvel UK's 'Collector's Edition' line.
 It is being published by Panini Comics but reprints Marvel Comics from the United States.
 It began in 2005 around the release of the Fantastic Four film and follows the format established by the Collector's Edition Range.
 "Fantastic Four Adventures" is sold once every 28 days through newsagents, although a subscription offer is available.
 "Fantastic Four Adventures" retailed at £2.40 upon its release, but rising in printing costs have seen the price rise to £2.50 and then onto the current price of £2.95.
 It was announced at the end of 2011 that "Fantastic Four Adventures" would cease publication with its final issue in March 2012, only to be replaced by a new CE, "Incredible Hulks".
Cthulhu is a fictional cosmic entity created by horror author H. P. Lovecraft

Question: Which fictional cosmic entity that consumes planets is the longtime Fantastic Four foe?
Answer: Galactus