I know who Hubbard is - I just don't know how much of Scientology is about aliens building pyramids or Pumapunku which is what "Ancient Aliens" refers to.
Not much, if any at all. Xenu and all the alien stuff is Scientology's mythology, similar to any religion's mythology. It's really no different than Mormonism's Kolob (star world). The fact that these religions incorporate aliens into their mythology is interesting, which is the only reason I know so much about the two. Although I don't know if I'd call Scientology a religion, it is more like a cult than anything else. I bought
Dianetics about 6 years ago and read half of it. I couldn't finish it, I don't remember why... I probably just got bored. But it's pretty much Scientology's holy-book, and it reads like a complex fictional narrative, similar to Hubbard's other books. I did, however, find Scientology's use of aliens in their creation myth more unique and especially more believable than a omnipotent God creating everything.
There's actually a sect of Scientology called "Free Zone" that practice the "religion" without influence from the Church of Scientology (because they're fucking nuts). Free Zone practices what's in Dianetics, which not surprisingly, the CoS strongly deviates from yet still claims that they are following Hubbard's vision. They're not wrong, since Hubbard's actions speak louder than his words, but
Dianetics practically condemns the Church of Scientology in it's current exploitative state. I'm fairly convinced Hubbard wrote
Dianetics as a part of a larger fictional series, but then something clicked in his brain and he decided to turn it into a psuedo UFO cult text.
Dianetics is not in any way covered by legislation anywhere, for no law can prevent one man sitting down and telling another man his troubles, and if anyone wants a monopoly on dianetics, be assured that he wants it for reasons which have to do not with dianetics but with profit.—L. Ron Hubbard,
Dianetics: The Modern Science of Mental Health (1950)
It's almost like Hubbard didn't even know what he wrote in
Dianetics, since his actions after forming the religion were largely inspired by avarice.
Anyways, I'll stop now. This is off-topic, and the whole entire thread should probably be moved anyways since it has nothing to do with FET.