Christian Toft Madsen's Video Review of Goodman Games version of S3 Expedition to Barrier Peaks explores the origins of the combination of Science Ficiton and Fantasy, going back to Dave Arneson, John Snider, MAR Barker, James Ward, Rob Kuntz and others.

https://vimeo.com/455202930

-Havard

Cool!

I've always liked the SF/fantasy mix - it's odd how it was pretty common in the oldest material (Barsoom references in OD&D, Temple of the Frog in the OD&D Blackmoor supplement, S3, etc.) but declined rapidly in favor of 'classic epic fantasy' by the latter part of the 1E AD&D era (Dragonlance, FR, etc.)