Beneath the Planet of the Apes (1970)

In "Beneath the Planet of the Apes," a new astronaut crash-lands on the mysterious ape-ruled planet and discovers a group of human mutants living underground. As tensions rise between the apes and the mutants, the surviving crew from the first film must navigate this dangerous landscape to uncover the planet's secrets. The film delves deeper into the themes of power, survival, and the consequences of prejudice.