Star Trek crosses over with the Planet of the Apes franchises in the Primate Directive. The Klingons have found a way to travel to other dimensions to a different universe on a future Earth where Apes and Klingons are working together. The majority of this issue is a set up for the set of the series and this issue has no interaction between the crew of the Enterprise and the Planet of the Apes. It would have been acceptable if the narrative was told in a Starlog where Kirk explains the situation and immediately arrives on the Planet of the Apes where the action takes place.
The second issue of Star Trek/Planet of the Apes brings the crew of the
Kirk
and Taylor return to Earth to discover a civil war between the apes is about to
begin. Dr. Zira warns her fellow people the gorillas are launching an attack to
claim dominance over them. However Kor is using a sniper rifle to start the
civil war himself but
Kirk and Taylor stop him. Civil
war is averted and Kirk and his crew leave the Planet of the Apes. Kirk is
chasing Kor’s ship who is heading towards the portal until Earth’s atmosphere is
consumed by a Doomsday device as the events unfold from Beneath the Planet
of the Apes. Thanks to the interference of the Enterprise crew, the events
of Escape of the Planet of the Apes unfold revealing how they managed to
slingshot back in time. The first 4 issues of the crossover was less exciting but
the final issue gave us the pay off the readers needed.