List of all D&D planets?

[Steely_Dan]

The terminology has changed between editions and sometimes between authors within an edition of the game. I generally assume the 2e model that there's one (Prime) Material Plane, and it's like our own universe with a myriad of galaxies, stars, and planets therein.

Now at some point in 3e there was a move away from the meta-setting connections in 2e between the various campaign settings (Toril, Oerth, Athas, etc) all planets within the same material plane) and you had different worlds being described as "alternate material planes". My inner continuity devotee screamed in rage a lot, as the garbled terminology is needlessly confusing IMO.

Total, in Dragon Kings Athas is in an Alternate Material Plane, but in The Spacefarer's Handbook it's in a closed crystal sphere.

 

[Jacob]

Throw in the Gith and you have the chaos or trying to understand the origin, reign and fall of the Mind Flayers/Illithids. Space, planar and time travel galore.

Aelos, the world being conquered by the Oard in CM6 Where Chaos Reigns. The PCs visit multiple eras in the world's timeline in order to stop the Borg ... er Oard ... from rewriting history.

And thus my head has officially begun to hurt. From trying to comprehend that cluster, and the awesomeness that it is. Mostly the fact it's a huge cluster, but as it goes.