- Script
- John Warner
- Pencils
- Rico Rival; Alfredo Alcala (illustration)
- Inks
- Rico Rival (illustration); Alfredo Alcala (illustration)
- Letters
- typeset
art and photograph used are from article and comic stories
- Script
- John Warner
- Pencils
- Alfredo Alcala (illustration)
- Inks
- Alfredo Alcala (illustration)
- Letters
- typeset
two panels from previous issue
- Script
- Doug Moench (credited)
- Pencils
- Rico Rival (credited); Walter Simonson (credited as Walt Simonson) (page 1)
- Inks
- Rico Rival (credited); Walter Simonson (credited as Walt Simonson) (page 1)
- Letters
- Irv Watanabe (page 1); Marcos Pelayo ?
- Genre
- science fiction
- Reprints
Continued in issue #21. Splash by Walt Simonson, credited in Archie Goodwin's editorial. Goodwin explained that "Kingdom On an Island of the Apes" was originally intended for a POTA Annual. When that tile was cancelled Goodwin decided to publish the story in POTA in two parts necessitating an additional page.
Chapter 3: The City!
Chapter 4: The Island Out of Time
Chapter 5: Battle
- Script
- Doug Moench (credited)
- Pencils
- Alfredo Alcala (credited)
- Inks
- Alfredo Alcala (credited)
- Letters
- Alfredo Alcala (sourced)
- Genre
- science fiction
- Reprints
Part 5 of BENEATH THE PLANET OF THE APES movie adaptation