Escape From the Planet of the Apes (1971) Roddy McDowall and Kim Hunter are Cornelius and Zira for the third time, and this time, they managed to travel back in time to 1971 Los Angeles. There are some forces that be that see the talking apes as a threat to humanity, so they set out to exterminate Zira’s pregnancy. Bradford Dillman (Piranha) helps them escape, and circus owner Ricardo Montalban hides them out. Fun movie, and it had a good ending.
Conquest of the Planet of the Apes (1972) First let me give you the timeline. In 1983 a virus killed all dogs and cats on the planet. Humans began keeping apes as housepets, but by 1991 the quick learning apes are now used as slave labor. The apes still can’t talk yet, but they understand enough to wait tables (poorly) mix cocktails and mop floors. Seems like a rapid evolution, going from wild animals to walking upright in 8 years, but hey, it’s a movie. Roddy McDowall is Caesar, son of Cornelius and Zira, who has been kept hidden by Circus owner Ricardo Montalban for 20 years. Caesar, the only ape yet with the ability of speech, witnesses inhumane treatment of his fellow simians, so he infiltrates the ape-slave training facility and leads a revolt! The film had some obvious holes, but it was dumb fun, and out of the films in the original series, has the most in commom with 2011’s Rise of the Planet of the Apes. Directed by J. Lee Thompson (Happy Birthday to Me, and eight Cannon/Charles Bronson films)
Battle for the Planet of the Apes (1973) Fifth and final film in the original franchise. Roddy McDowall reprises his role as Caesar, now King of the Apes. Claude Akins plays General Aldo, a violent gorilla ready to lead an uprising against the smarter chimps and orangutans. Some mutant humans who live in the ruins of the post-war city, find the ape city and attempt a takeover. The timeline on this was all wrong. It was about 20 years after the previous sequel in witch Caesar was the only talking ape, and now all apes had speech. Also Caesar did not appear older, and somehow there were some apes that were older and wiser than him. McDonald, the human who helped Caesar escape in the previous entry, had also not aged in over 20 years. Paul Williams and John Huston were also in this.
In 1974, McDowall would return in Planet of the Apes TV series, which consisted of 14 hour-long episodes. In 1975, there was an animated series called Return to the Planet of the Apes.