Much of the Ancient Aliens mythos was lifted from Lovecraft. Things enter the culture, bounce around, and then end up in all kinds of places. It doesn't have to be conscious plagiarism. The cultural baggage is just in our head, regardless of the provenance. Many of the adrenachrome believers may not even realize the provenance of blood libel and its anti-Semitic roots.
Tem esse também dele sobre o Lovecraft: https://www.amazon.com.br/Cult-Alien-Gods-Extraterrestial-Extraterrestrial-ebook/dp/B002OB5JOU/ref=sr_1_4 The Cult of Alien Gods: H.P. Lovecraft And Extraterrestial Pop Culture. Pena que só tem em inglês. Conheci o autor porque ele escreveu uma série de críticas pra aquela série falcatrua de TV Enigmas Revelados (America Unearthed) do Scott Wolter.