Savage Tales (vol. 1) #8 (Jan. 1975):
“The Billion Year War!”
by Gerry Conway, John Buscema, Tony DeZuniga

Savage Tales (vol. 1) #8

Title: “The Billion Year War!”

Feature: Ka-Zar (Kevin Plunder)

Medium: comic

Cover date: Jan. 1975

Publisher: Marvel
Written by: Gerry Conway
Art by: John Buscema, Tony DeZuniga

3 characters in this story:

(Click links for info about character
and his/her religious practice, affiliation, etc.)
Pub. #
Ka-Zar Ka-Zar (Kevin Plunder)
(lead character)
  [aristocrat; fisherman...] Marvel 315
Bobbi Morse hero
  S.H.I.E.L.D.; The Avengers... 
[was Hawkeye's wife]
Marvel 293
Shanna the She-Devil Shanna the She-Devil (Shanna O'Hara Plunder) hero
  [1st app: Shanna, the She-Devil (vol. 1) #1 (Dec. 1972)] Marvel 158

This comic story is divided into two parts, or two chapters. But these two chapters really comprise a single comic book story. The cover even heralds the story as "The War that Time Forgot! A Movie Length Saga of the Savage Land" Both parts have exactly the same creative team. The first chapter is titled "The Billion Year War!" The second chapter is titled "Part Two The War that Time Forgot!"