I was wondering what to do next when I started thinking...cartoons! I watched some dandy adventures on Saturday mornings so why no use that? Space Ghost, Thundarr and the Herculoids can provide a lot of story plots and action. Shift the 'science' to magic (really 1960s SiFi science was magic, radiation could make anything!) and throw thae bad guys and situation at the player's characters and bam...action! Watch a few of these episodes on line and see if they don't fit the S&S bill nicely.
https://en.wikipedia.org/wiki/The_Herculoids
http://www.tv.com/shows/thundarr-the-barbarian/episodes/
https://en.wikipedia.org/wiki/Space_Ghost_(TV_series)