The Kallusians were a race of aliens who were forced from their home planet by an interplanetary war. Decimated and pursued by their foes, the Yirbek, they fled to Earth to repair their weapons and regroup their forces, but the amount of oxygen was too low for them and they started suffocating. They constructed a base under the North Pole. The Earth scientist Doctor Svenson, performing in-site research, was discovered by them. Moved by their plight, Svenson offered to help them, constructing equipment to help them survive in the Earth's atmosphere, which was otherwise lethal to the Kallusians.
When the Wasp was shot during the Avengers' battle against Count Nefaria, her lung was punctured and the only doctor skilled enough to save her was Doctor Svenson. The Avengers sought out Svenson, and discovered he had been replaced by a Kallusian impostor. Discovering their polar base, the Avengers clashed with the Kallusians, trying to free Svenson. At the same time, a fleet of star ships in pursuit of the Kallusians entered orbit around Earth. The Kallusians agreed to leave Earth and confront the enemy fleet light-years from there, while the Avengers remained on Earth with Svenson. Only The Earth's Watcher kept track of that battle, and to most Earthlings, the result of it is unknown.
The Kallusian Root-Digger was apparently a burrowing beast coming from the same planet. The Skrulls could impersonate such an animal, as done by Raksor in an attempt to escape the Inhumans by digging.
Powers and Abilities
They need special oxygen mask to provide them with extra oxygen when in Earth.
Arctic over much of the planet with 74% water surface covered
110% Earth standard
47% nitrogen, 41% oxygen
Type of Government
Level of Technology
Advanced interstellar starships with warp drive, teleportation, and weaponry of great power; their gear could destroy Earth. They also have warp-compliant interstellar starship and teleportation technology.
Honest, courageous, perseverance