When Avengers: Infinity War explodes into theaters next year, it will see 10 yeas worth of Marvel heroes created on the big screen uniting for a battle against their toughest opponent yet: Thanos.

Over the weekend at Disney's D23 Expo, Marvel Studios revealed this battle to be even more of a challenge than anyone had imagined when they literally dropped the curtain to show off the Black Order. The Black Order, or Cull Obsidian, are Thanos' loyal steeds who help him raze planets in Jonathan Hickman's Infinity comic from 2013. However, in the Marvel Cinematic Universe, the four characters coming to the big screen will see a major change.

One of Thanos' main goals in the Infinity comic was to find his son Thane. Each member of the Black Order is sent to different locations in an effort to find him. However, in Avengers: Infinity War, these characters will be the children of Thanos.

This major change was revealed by the host at Marvel Studios' booth who introduced each character individually before calling them the "children of Thanos." From there, executive producer Louis D'Esposito tweeted a photo of the characters as they appeared at the Marvel Studios D23 booth with those three words in his caption.

This likely changes their mission, as well. Instead of hunting for Thanos' son, the members of the Black Order will likely be hunting for Infinity Stones as the Mad Titan attempts to load up his Gauntlet.

The Marvel Cinematic Universe's Black Order consists of Ebony Maw, Corvus Glave, Proxima Midnight, Supergiant, and the Black Dwarf. The group is also referred to as Cull Obsidian on the pages of Marvel Comics.

After the first footage from Avengers: Infinity War was released, the characters were unveiled at Disney's D23 Expo in the Anaheim Convention Center over the weekend.

Josh Brolin unveils Avengers: Infinity War's Black Order and Infinity Gauntlet! https://t.co/K5E5oZ4j8A pic.twitter.com/mQ8EVJ5Mmu — Comicbook.com (@ComicBook) July 15, 2017

The change to these characters gives extra meaning to Thanos' line in Guardians of the Galaxy, where he tells Nebula, "You alienated my favorite daughter, Gamora." This confirms the two cosmic siblings were not the only children of the Mad Titan, after all.

Ebony Maw's most dangerous weapon is his thinking ability. Working in Thanos' Black Order, Ebony Maw was sent to Earth to deal with Doctor Strange, one of the smartest Earth-based heroes, in the Infinity comic story. Corvus Glaive, a member of the Black Order, is married to Proxima Midnight. When Thanos decided he would raze Earth in search of his son, Corvus Glaive was sent to the Jean Grey School for Higher Learning. Proxima Midnight is sent to Atlantis, where she is to retrieve an Infinity Stone from Namor. Black Dwarf was sent to Wakanda, where he met a resistance much greater than he anticipated.

Avengers: Infinity War opens May 4, 2018.

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