Erich von Däniken - Descent in the Andes

Erich von Däniken (who has just died) was one of the best known exponents of the Ancient Astronaut theory, this is the one that aliens visited Earth in the distant path and helped mankind developed into the intelligent being he is (apparently), and built stuff like the pyramids with exotic technology, and stuff like that. 

When i was a kid i used to love this stuff, though of course much of it was nonsense and i later found out that von Däniken was rather shameless in falsely presenting doctored evidence to support his claims. 

However, it was a popular thing in the 1960s and 1970s and a fun aspect of the craze in the 1970s was the publication of a series of comic books about a group of aliens led by Ais and Zen who have come to Earth in the distant past to change the biology of primitive ape-men to create homo sapiens. This is a great science fiction adventure romp. In this first volume the aliens arrive on Earth and begin their plans...

Not really to be taken that seriously like many of the Ancient Astronaut works really should be, though unfortunately many have.