Beneath the Planet of the ApesBeneath the Planet of the Apes
was the first sequel to the 1968
movie Planet of the Apes
It stars Charlton Heston
(although he is in a very small supporting role) and James Fransicus (although Burt Reynolds
was originally intended for this role). The military Ape General was originally supposed to be played by Orson Welles
Warning: Wikipedia contains spoilers
The ending takes place under the planet's surface with a confrontation between an army of apes, Heston and Fransicus, and a mutated white robed people who worship "the bomb". The planet is destroyed by the atomic bomb going off via the hand of Heston.