[Bear_in_RoseBear]

According to this website, Invasion of the Body Snatchers was based on a serial and later novel titled The Body Snatchers, written by Jack Finney. The stories are very similar, though, and Finney's story was published after The Puppet Masters...

[Fedora]

I think I'd heard of the Finney version but my understanding was he borrowed from Heinlein pretty blatantly. I guess I should do a detailed comparison sometime--would be an interesting project.

BTW, has anyone ever tried adapting Stranger in a Strange Land? I'm kinda surprised if not, seeing how popular that was in the 60s.