The Covenant are an army of aliens and are one of the primary species of antagonists of Super Smash Bros. Brawl Crossover. They are an alien empire who are in search of the Chaos Emeralds and Master Emerald in which they believe it will make them the most powerful beings but will actually corrupt the universe or even destroy it. They have invaded many planets such as Mushroom Kingdom, Planet Popstar, and even Earth, and are the primary antagonists towards Mario, Master Chief, Toa Mata, Kirby, Knuckles the Echidna, and other Heroes who are trying to stop them.
In the year 1994, the Grunts, Elites, Jackals, and Hunters fought over each other determining which alien is considered to be the most dominant species to reside Earth to make a colony. As the aliens battled each other, they encounter an mysterious figure confirmed to be named Teridax. Teridax begins guiding them to a ancient ruin in which it appears to be foreign to Earth originating from another galaxy. It has carvings of ancient figures wielding powerful materials, Teridax confirms it to be Chaos Emeralds, ancient materials created by the Matorans in which it will corrupt anything if anyone misuses it, Teridax begins to deceive the aliens that the person who takes control of it will become invincible and powerful and vows them that if they locate them, they will become the strongest beings in the galaxy, resulting in the aliens to unite each other and form an empire known as The Covenant. They have hunted down and searched for the artifacts across the galaxy, when they travel to Earth, they have battled with the humans and animals and as well initiating a rivalry with them. The Covenant debut in the beginning of Season 1 as the main organization of antagonists where they begin to deceive Mario, Luigi, and Wario by sending them invitation for an party at Princess Peach's castle. As they reach the castle they soon realize that The Covenant have invaded Mushroom Kingdom capturing every resident and imprisoning Mario, Luigi, and Wario, leaving Master Chief, Link, Kirby, and Yoshi to stop them. As they battle, The Covenant send in an Wraith in attempt to defeat the heroes but somehow Kirby and Yoshi were able to counter the tank with the help of Master Chief. This grew The Covenant more angered and sent in endless waves of Elites and outnumbering the heroes. However just before the alien empire could capture Master Chief and his allies, an strange being known as Mata Nui appears to save Master Chief, Toon Link, Kirby, and Yoshi, and free Mario and his friends. Mata Nui later reveals that The Covenant are not only conquering Mushroom Kingdom but also are searching for the Chaos Emeralds and Master Emerald.