The 3rd film in the Apes series (after "Beneath..."), this one is easily the most whimsical, at least in the first half. The writers had to stretch believability in getting the two primary apes of the 1st 2 films into our present times from the future, when Earth is destroyed by a doomsday bomb, but the first few scenes are almost classic farce disguised as science fiction storytelling. We view our central characters first as 'ape-onauts' and then stuck in a zoo, followed by a brief turn at celebrity when our populace becomes enamored of the two as the latest fad. The best and most clever thing about this sequel is that it utilizes the already well-known captivating characteristics of the chimps, delightfully performed again by McDowall and Hunter. They're kind of like old friends by this time and seeing them get acquainted with our modern-day culture is just good times. It's also a neat reversal on the ape society of the first two films, which was visited by aberrant intelligent humans.
Things turn grim in the 2nd half, as the fad wears off and our leadership begins to take the threat of possible future ape domination rather seriously. The most interesting character becomes the chief human scientist, played by Braeden, who starts out typically dispassionate but soon reveals an intense personal desire to preserve the human race and society, to the point of fanaticism. In his coldly intelligent eyes, only he sees the truly apocalyptic threat presented by the chimps' pregnancy. He's the nominal villain, but he sees himself as the only one who gives a damn. Some of the sf plot lines regarding time travel are very clever, while others are a bit clumsy. It's clever that the two evolved time-traveling chimps may now be the cause of the future time-line ruled by an ape society. But they reveal to have a knowledge of their history that did not exist in the previous two films. Also, rather than letting events evolve over a century or more following what happens here, the next film accelerates everything to change the world in the next 20 years - see "Conquest of the Planet of the Apes."
