History Film / BeneathThePlanetOfTheApes

* [[ArtisticLicenseNuclearPhysics You Fail Nuclear Physics Forever]]: Okay, a cobalt bomb would be a pretty nasty weapon, in the [[SaltTheEarth "create lots of long-lasting fallout"]] sense. ''Not'', however, in the "turn the planet's whole atmosphere into a gigantic nitrous-oxide fireball that incinerates the whole surface" sense. Though the original intention was for it to be just an ordinary nuke that would just wipe out the two warring factions, but Charlton Heston suggested an expansion to EarthShatteringKaboom.

* CargoCult: The mutants' god is a nuclear bomb.
** For some amazing LyricalDissonance, the mutants' mantras are quite obviously Christian hymns with all references to "God" changed to "Bomb".

* EverybodyDiesEnding: Literally everybody. [[spoiler: Except Cornelius and Zira, as it turns out in the next movie.]]

** In the first movie Taylor’s narration makes it clear they will never return to Earth by design, so why is Brent on a rescue mission? And how could Earth possibly know they needed help in the first place? Not to mention Taylor's expedition ''intended'' to go to a different planet, not Earth in the future, so how would they even know where to look?

* ApeShallNeverKillApe: Ends up being TropeNamer three movies earlier than the most famous instance, although slightly different. When the advancing army of Apes is confronted by a vision of apparently butchered scouts, Zaius suggests giving the "scouts" a MercyKill, but Ursus replies that "I can't order them to do what the Lawgiver has forbidden. ''Ape shall not kill ape.''"

* DownerEnding: "''In one of the countless billions of galaxies in the universe, lies a medium-sized star, and one of its satellites, a [[InsignificantLittleBluePlanet green and insignificant planet,]] [[EarthShatteringKaboom is now dead.]]''"

A fellow astronaut, Major Brent, is sent to find Taylor and rescue him... and also crashes on the Planet of the Apes. He first finds Taylor's girl Nova. After they discover a former New York City subway station in a cave, he realizes where-as well as when-he is. The station leads to an ElaborateUndergroundBase inhabited by mutant humans with psychic powers, who have already imprisoned Taylor, and cultivate a "[[PointlessDoomsdayDevice Divine Bomb]]". When the apes decide to invade the ForbiddenZone and then find the mutants' lair... well, the trope examples below show it's catastrophic.

A fellow astronaut, Major Brent, is sent to find Taylor and rescue him... and also crashes on the Planet of the Apes. He first finds Taylor's girl Nova. After they discover a former New York City subway station in a cave, he realizes where-as well as when-he is. The station leads to an Underground Lair inhabited by mutant humans with psychic powers, who have already imprisoned Taylor, and cultivate a "[[PointlessDoomsdayDevice Divine Bomb]]". When the apes decide to invade the ForbiddenZone and then find the mutants' lair... well, the trope examples below show it's catastrophic.

* MaskingTheDeformity: The mutant humans who survived underground appear to have normal features. Near the end of the movie, it's revealed that they're all wearing latex masks to make them look normal because their faces are horribly disfigured.

* PlotHole: Famously, the year of the "present" in ''Beneath'' is given as roughly 20 years earlier than the year that was declared the "present" when Taylor landed in the original movie. And then ''Escape'' uses the same date for Taylor & Brent's doomed expeditions given in ''Beneath''.
** In the first movie Taylor’s narration makes it clear they will never return to earth by design, so why is Brent on a rescue mission?

* SuspiciouslySimilarSubstitute: Brent for Taylor, though in terms of attitude he's far different.
** [[PoorMansSubstitute James Franciscus]] was even cast as Brent because of his CelebrityResemblance to Charlton Heston.

* KillEmAll: Literally all. [[spoiler: Except Cornelius and Zira, as it turns out in the next movie.]]

A fellow astronaut, Major Brent, is sent to find Taylor and rescue him... and somehow also falls in the Planet of the Apes. He first finds Taylor's girl Nova. After they discover a former New York City subway station in a cave, he realizes where he is. The station leads to an Underground Lair inhabited by mutant humans with psychic powers, who have already imprisoned Taylor, and cultivate a "[[PointlessDoomsdayDevice Divine Bomb]]". When the apes decide to invade the ForbiddenZone and then find the mutants' lair... well, the trope examples below show it's catastrophic.

* BeneathTheEarth: Has one that combines both urban and caverns. The humans who escaped the fall of civilization thousands of years earlier retreated to buried New York City and due to living next to a giant nuclear warhead, they became mutant, telepathic humans by the time Taylor and the rest arrived.

* InThatOrder: "If they catch you, they will dissect you. And kill you. In that order."

* SayMyName: Nova's first ([[SuddenlyVoiced and only]]) word is "TAYLOR!"

The sequel to this movie, ''Film/EscapeFromThePlanetOfTheApes'', was released in 1970.

The first sequel to ''Film/PlanetOfTheApes1968'', released in 1970.

A fellow astronaut, Brent, is sent to find Taylor and rescue him... and somehow also falls in the Planet of the Apes. He first finds Taylor's girl Nova. After they discover a former New York City subway station in a cave, he realizes where he is. The station leads to an Underground Lair inhabited by mutant humans with psychic powers, who have already imprisoned Taylor, and cultivate a "[[PointlessDoomsdayDevice Divine Bomb]]". When the apes decide to invade the ForbiddenZone and then find the mutants' lair... well, the trope examples below show it's catastrophic.

* TechnicalPacifist: The mutants; they insist they are a peaceful people because they "only" defend themselves by using their PsychicPowers to either MindRape their victims to insanity/suicide or MindControl them into killing each other. Brent outright calls them hypocrites.

* YouFailNuclearPhysicsForever: Okay, a cobalt bomb would be a pretty nasty weapon, in the [[SaltTheEarth "create lots of long-lasting fallout"]] sense. ''Not'', however, in the "turn the planet's whole atmosphere into a gigantic nitrous-oxide fireball that incinerates the whole surface" sense. Though the original intention was for it to be just an ordinary nuke that would just wipe out the two warring factions, but Charlton Heston suggested an expansion to EarthShatteringKaboom.