A yellow amphibian species with tentacles for arms that resembles a manta ray or frog. They live in the vast oceans on their homeworld, Leera, which has only one small continent of land (originally, Leerans needed to go on land to mate, but technology has made that unnecessary). Leerans have advanced psychic powers, which make them very desirable Yeerk hosts.
Lepidopterrans come in two variations depending on the series. In the Original series, they resemble a combination of dragonflies, hornets, and butterflies, and are equipped with sharp stingers on their tails and four penduculated eyes on the sides of their heads. In the reboot, however, they more closely resemble humanoid dragonflies, complete with antenna and compound eyes. Both versions can spray foul smelling slime and fly at high speeds, but are frail and not particularly strong.
Thread-like creatures that can be merged with either clothing or human beings. Appear to be a hostile hive-mind with the ulterior motive of planetary destruction.
Gelatinous, shapeshifting creatures who are carnivorous in nature, more specifically preying on elderly humans. They are fond of high levels of heat, but are weak to and afraid of water.
Neckless bipeds who veil themselves and their spacecraft in shadow. Soft-spoken but powerful. Feared on the planet Ryn, whose empire they destroyed 30 thousand years ago.
Aliens resembling werewolves hailing from the moon Luna Lobo, they are very vicious hunters. Alongside enhanced strength, speed, hearing, and agility, they can see in the dark and unleash powerful sonic howls.
