Question: Marvel Super Heroes In War of the Gems includes a plot to seek out what six immensely powerful fictional gems?

Context articles: Marvel Super Heroes Advanced Set
Infinity Gems
Marvel Super Heroes In War of the Gems
Lego Marvel Super Heroes: Maximum Overload
Marvel Super Heroes: The Heroic Role-Playing Game
Marvel Super Heroes Adventure Game
Lego Marvel Super Heroes
Lego Marvel Super Heroes: Avengers Reassembled
Lego Marvel Super Heroes 2
Clark Gregg

Marvel Super Heroes Advanced Set is a role-playing game supplement published by TSR in 1986 for the "Marvel Super Heroes" role-playing game.
The Infinity Gems, originally referred to as Soul Gems, are six immensely powerful fictional gems appearing in American comic books published by Marvel Comics.
 Whoever holds all six gems and uses them in concert, such as in the Infinity Gauntlet, gains virtual omnipotence and omniscience.
 The six primary gems are the Mind Gem, the Soul Gem, the Space Gem, the Power Gem, the Time Gem and the Reality Gem, and in later storylines, crossovers and other media, a seventh Infinity Gem is sometimes added.
 The Gems play a prominent role in the first three phases of the Marvel Cinematic Universe, where they are known as the Infinity Stones.
Marvel Super Heroes In War of the Gems (マーヴルスーパーヒーローズ ウォーオブザジェム , Māvuru Supā Hīrōzu: Wō obu za Jemu ) is a 2D action platformer video game developed by Capcom for the Super Nintendo Entertainment System, based on the events of Marvel Comics' series, "Infinity Gauntlet".
 In the game's plot, Adam Warlock calls upon Earth's greatest superheroes to seek out the Infinity Gems before they fall into the wrong hands.
Lego Marvel Super Heroes: Maximum Overload (also known as Marvel Super Heroes: Maximum Overload) is a computer-animated Lego film based on Marvel Comics characters that were also featured in "Lego Marvel Super Heroes".
 It premiered online in five parts on November 5, 2013.
 The film can also be viewed on Netflix and Amazon Video being free with Amazon Prime.
Marvel Super Heroes: The Heroic Role-Playing Game is a role-playing game supplement published by TSR in 1984 for the "Marvel Super Heroes" role-playing game, and was the debut boxed set for the game.
The Marvel Super Heroes Adventure Game is a role-playing game published by TSR, Inc. that uses the "SAGA System".
 It should not be confused with the earlier "Marvel Super Heroes Game" (also published by TSR) or the later "Marvel Universe Roleplaying Game" (published by Marvel Comics).
Lego Marvel Super Heroes is a Lego-themed action-adventure video game developed by Traveller's Tales and published by Warner Bros.
 Interactive Entertainment for the PlayStation 3, Xbox 360, Wii U, PlayStation 4, Xbox One and Microsoft Windows, and published by Feral Interactive for OS X.
 The game features gameplay similar to other "Lego" titles, such as "" and "", alternating between various action-adventure sequences and puzzle-solving scenarios.
 The handheld version of the game by TT Fusion was released under the title Lego Marvel Super Heroes: Universe in Peril for iOS, Android, Nintendo DS, Nintendo 3DS and PlayStation Vita.
 Characters include the Avengers, the X-Men, the Fantastic Four, Spider-Man, Wolverine, Deadpool, Silver Surfer, The Guardians of the Galaxy, Black Panther, and Nick Fury.
Lego Marvel Super Heroes: Avengers Reassembled is a computer animated Lego film based on Marvel Comics characters that appeared in "Lego Marvel Super Heroes" and "Lego Marvel's Avengers".
 The film first aired on Disney XD.
 It is available to watch at Lego.com.
Lego Marvel Super Heroes 2 is an upcoming Lego-themed action-adventure video game developed by TT Games and published by Warner Bros.
 Interactive Entertainment for Microsoft Windows, PlayStation 4, Nintendo Switch and Xbox One on 14 November 2017.
 It is the sequel to "Lego Marvel Super Heroes" and the third installment of the "Lego Marvel" franchise.
Robert Clark Gregg (born April 2, 1962), known professionally as Clark Gregg, is an American actor, director, screenwriter and voice actor.
 He is best known for the role of Agent Phil Coulson in the Marvel Cinematic Universe.
 He has appeared in "Iron Man" (2008), "Iron Man 2" (2010), "Thor" (2011), "The Avengers" (2012), and the television series "Agents of S.H.I.E.L.D." being the actor with the longest screen time in the MCU.
 He also voices the character on the animated television series "Ultimate Spider-Man" and in the video games "Lego Marvel Super Heroes", "Lego Marvel Avengers" and "Marvel Heroes".