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Message: <blockquote data-quote="R_Chance" data-source="post: 7678100" data-attributes="member: 55149"><p>The multiverse idea was in D&D from the beginning. It's in the cosmology as first put forward in The Dragon (I don't remember the exact issue). That's why there are prime material planes (plural). It's why all the material in the original supplements was done for D&D as a whole. I'm old (my students say ancient). I started playing in 1974 and the connection between Greyhawk and Blackmoor (for example) was a given. Originally both were set in the Castle and Crusades Society as miniature campaigns / settings. Later it evolved into pretty much all the settings existing as separate prime material planes... I'm surprised anybody doubts that this was the idea, if not from the beginning, certainly before AD&D came out. They roped in other games / genres later as well. Gamma World for example. And, iirc World War II (Tractics). They weren't as dogmatic about separating things. Of course, without going back and doing a lot of research (and I'm prepping for a new school year) it's all imho.</p></blockquote><p></p>