TIL Not only did Marvel Comics do radio drama adaptations of early Fantastic Four comics in 1975, The Human Torch was played by a young Bill Murray!
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Fantastic Four-10 episodes : Free Download, Borrow, and Streaming : Internet Archive
https://archive.org/details/FantasticFour-10Episodes/Fantastic4-01-MeetsTheMoleman.mp3
10 episodes of marvel comics fantastic four radio show
Stan Lee himself narrates.
They're extremely cheesy, but so were early FF comics.