Dan O'Bannon's Original Alien Story

leading from 

Alien

a) Discovery of the planetoid
b) The Space Jockey's Remains
c) The Pyramid
d) Spore to Facehugger
e) Chestburster to Adult
f) Dead Planetoid
g)  Space Jockey Story
h) Host to Spore: The Cocoon scene
i) Mysterious references in the script