Ancient Astronauts

The Ancient Astronaut Hypothesis is an idea popularized by pseudo-archaeologist and author Erich von Däniken in his book Chariots of the Gods?, the hypothesis states that the deities of all Earth religions where, in fact, extraterrestrial beings, this also plays into the ideas that being from outer space constructed (or taught Humans how to build) many major global landmarks in antiquity, you can find these beliefs permeating many pseudo-scientific and New Age circles, but they do occasionally appear in science fiction, and here are such teachers from beyond the sky.