The Eddorians are a fictional alien race and the main antagonists of the Lensman series of sci-fi novels by writer EE Doc Smith.
The Eddorians are a psychic dictatorial, power-hungry shapeless species from the planet Eddore in another universe where the laws of physics are different. They were attracted to this universe by the observation that the Milky Way and a sister galaxy, the Wolf-Lundmark-Melotte galaxy might be passing through each other. The Eddorians believed that this would result in the formation of billions of planets and the development of life upon them. Dominance over these life forms seemed to the Eddorians the logical course of action. This dominance isexercised on their behalf by a hierarchy of underling races.
The Eddorians themselves are physically similar to various lower Earthly life-forms, reproducing by fission but by a process more similar to budding than to cell division, except that each being's memories are preserved. They are highly competitive, extremely long-lived, and almost impossible to kill.