Dragons were animals that were biologically reptilian or serpentine. Most dragons were capable of breathing fire.
They were common on many different worlds throughout the depths of outer space, including the Earth.
The homeworld of dragons was never specified. Due to the fact that dragons were found on multiple planets throughout the galaxy made it impossible to be certain. There were dragons on Vaxon, Earth and the Rubberoid Homeworld had dragons as well.
Presumably they were taken to those various worlds by a race that was capable of spaceflight long before most humans were.
- ↑ As seen in the Superfriends season 4 episode The Lord of Middle Earth (1979).