Terradon

Terradon was a planet in E-Space. (TV: Earthshock) There were known to be native Terradonians, though the Alzarians attempted to immigrate there later via the Starliner. (TV: Full Circle)

When Adric and the Fifth Doctor fought over Adric's claim that the Doctor didn't pay attention to him, Adric demanded that the Doctor take him home to Terradon; the Doctor was reluctant to re-enter E-space, and told him so. (TV: Earthshock)