1975 Return to the Planet of the Apes Saturday Morning Cartoon

S1, E1 Flames of Doom Episode aired Saturday Morning, Sep 6, 1975
While on a mission, three astronauts in their spaceship get caught in a time vortex. They return to Earth in the year 3979 A.D. and discover that intelligent apes are now the highest form of life
Soon Judy is swallowed by the Earth and Bill and Jeff wind up in the company of primitive humans who are captured by talking apes.
Return to the Planet of the Apes is a 1975 American animated television series based on the 1968 film Planet of the Apes and its sequels, which were, in turn, based on the 1963 novel of the same name by Pierre Boulle.