Traits: Warlike and powerful (according to Cloud), the Dreollnians are ruled by a Monarchy. Their language and the naming of warrior with "Sir" in their name is similar to that of Old English as translated by the Cosmic Cube's translation devices.

    Royal guards apparently wear light, metallic armor.

Type: Bilaterally symmetric semi-humanoid bipeds
Eyes: Two (on head; they have a green or white central pupil or iris structure, which is either round or horizontally ovoid; which is surrounded by either white to perhaps light green (in most Dreollnians) or occasionally black as seen in Kaltenborn de Register-Cambric)
Fingers: Four (plus opposing thumb)
Toes: Unrevealed
Skin color: Green (with darker green patterns around their eyes)
Average height: Unrevealed (approximately 6'6" or 6'9"?; the queen looked at least 6" taller than the Beast who was 5'11" at the time; it is hard to get direct proportions in the few images where they are standing alongside people of known height)
Other distinguishing features: The Dreollnians have dark green, ornate markings around their eyes (I believe the markings in Sir Kaltenborn's image at the top left are just not drawn the correct, darker color, but it is possible that certain emotional states can cause them to blanch). They have open nares, with no external nose; no visible external ears; no philtrum (medial division of the skin above the superior/upper lip); and a somewhat elongated cranium.

(Defenders I#150 (fb) - BTS) - Child princess Ilse Pterigil was left comatose by a blinding laser beam of unrevealed origin that struck her and penetrated into her brain. Having been used to getting anything she wanted, the princess was severely traumatized by being cut off from the outside world. Her mind reached across space to tap the power of the now-sentient Cosmic Cube (later Kubik), a force field containing reality-altering energy, as it explored the cosmos. Mistakenly equating starlight with the laser beam that injured her and having never acknowledged the real existence of others and desiring to punish the light that hurt her regardless of the consequences, Ilse used the Cube’s energy to transport stars and their discharged light into a pocket dimension, destroying many civilizations dependent on them.

    The people of Dreolln were unaware of Ilse's actions, and her mother, the queen cared for her comatose daughter. Although the surgeons had told her their was no chance of recovery, the queen mother continued to maintain hope.

    Aware her brethren were vanishing, a relatively nearby sentient nebula’s radiated fear attracted the Cosmic Cube. Ignorant that its own power was indirectly the cause and unable to reverse the effect, the Cube befriended the nebula, and suggested the heroes of Earth might be able to solve the puzzle confronting them. The Nebula traveled to Earth but inadvertently rendered itself somewhat amnesiac by adopting the forms and memories of two recently deceased humans. As Cloud, the Nebula joined the Defenders.

    After regaining its memory, the Cloud Nebula transported the Defenders (Andromeda, Angel, Beast, Gargoyle, Iceman, Valkyrie), as well as ally Seraph, into space alongside the Cosmic Cube entity and told them of the mystery of the disappearing stars. They further joined forces with the Krugreppeans, shipbound survivors of a world destroyed when Ilse stole its sun.

(Defenders I#150) - After being confronted by the energy manifestation of the Star-Thief, 

the Beast appreciated that it was a mortal being and had not eliminated its own star. 

Beast speculated that Dreolln was within a large interstellar dust cloud

(Defenders I#150) - As the Krugreppean ship approached Dreolln, they were intercepted by  the Dreollnian fleet, who fired on them; Cloud maintained a stable atmosphere for the inhabitants despite the damage to the ship. With the ship virtually crippled, Andromeda had them fly right next to a Dreollnian ship, and then Cloud surrounded them as they boarded that ship. After Valkyrie tore open the hatch, the Defenders easily overpowered the Dreollnians.

     Beast and a Krugreppean he called "Curly" entered the ship's cockpit, where "Curly" grabbed the head of pilot Sir Kaltenborn de Register-Cambric and forced him to destroy the Krugreppean ship and then report that they had defeated the invaders and to order the fleet to stand down. Unwilling to allow the invaders to reach his planet, however, Kaltenborn set the ship's controls for annihilation.

     The Cube saved the Defenders and their allies and transported them to the surface, where the Star-Thief confronted them anew, but -- unwilling to harm its own planet -- its attacks were easily defended by the Cube, after which it returned to its mortal form.

    With Cloud now able to sense where the Star-Thief, the Cube then flew them to the ruling city, where they fought their way past the Dreollnian guards/soldiers present and into the palace. 

They continued to fight their way past other guards, ultimately surprising the queen mother when they burst into the room where she was watching over the comatose princess. After Cloud identified Ilse as the Star-Thief, the queen mother explained the events that had led to her daughter's condition. With the Angel having been recently blinded, Cloud linked his mind with Ilse's so he could try to get through to her. Learning of the existence of whole galaxies from Angel, the distrusting princess threatened to destroy galaxies as well as the invaders' individual minds. Beast convinced the queen mother to join the others in projecting their presence, their desire to help,  and their love into Ilse.

     The planet Dreolln exists in an unidentified star system, presumably in the Milky Way galaxy.

     It has land and seas, and apparently gravity and an atmosphere comparable to Earth's (although the former Cosmic Cube that would become Kubik may have just made it seem that way).

     The Dreollnians possess a large interplanetary fleet of spaceships able to fire energy blasts, although they lack warp drive.

(Defenders I#150 - BTS) - After the princess Ilse Pterigil began warping the stars into a pocket dimension, , a group of Defenders, as well as Seraph and the former Cosmic Cube, allied with a group of Krugreppeans and investigated the phenomenon.

     After being confronted by the energy manifestation of the Star-Thief, the Beast appreciated that it was a mortal being and had not eliminated its own star.

     Beast and a Krugreppean he called "Curly" entered the ship's cockpit, where "Curly" grabbed the head of pilot Sir Kaltenborn de Register-Cambric and forced him to destroy the Krugreppean ship and then report that they had defeated the invaders and to order the fleet to stand down. Unwilling to allow the invaders to reach his planet, however, Kaltenborn set the ship's controls for annihilation.

     The Cube saved the Defenders and their allies and transported them to the surface, landing in an ocean or sea and floating atop an immense disc mirroring Captain American's shield (created by the "Cube") where the Star-Thief confronted them anew, but -- unwilling to harm its own planet -- its attacks were easily defended by the Cube, after which it returned to its mortal form.

    With Cloud now able to sense where the Star-Thief, the Cube then flew them to the ruling city, where they fought their way past the Dreollnian guards/soldiers present and into the palace. Ultimately, they were able to mentally link up with Ilse, calm her fears and angers, and convince her to release the stars. 

     The Cube sent all the visitors back home as it began the process of restoring the stolen stars, starting with the Krugreppeans.

Sir Kaltenborn de Register-Cambric was the apparent commander of one of the ships in the Dreollnians interplanetary fleet.

(Defenders I#150 (fb) - BTS) - Seeking to investigate the Star Thief, a group of Defenders, as well as Seraph and the Cosmic Cube that would become Kubik, allied with a group of Krugreppeans and traced the stars' disappearances to Dreolln.

(Defenders I#150 - BTS) - As the Krugreppean ship approached Dreolln, they were intercepted by the Dreollnian fleet, who fired on them; Cloud maintained a stable atmosphere for the inhabitants despite the damage to the ship. With the ship virtually crippled, Andromeda had them fly right next to Sir Kaltenborn's ship, and then Cloud surrounded them as they boarded that ship. After Valkyrie tore open the hatch, the Defenders easily overpowered the Dreollnians.

     Beast and a Krugreppean he called "Curly" entered the ship's cockpit, where "Curly" grabbed the head of pilot Sir Kaltenborn de Register-Cambric and forced him to destroy the Krugreppean ship and then report that they had defeated the invaders and to order the fleet to stand down. Unwilling to allow the invaders to reach his planet, however, Kaltenborn set the ship's controls for annihilation.