Most critics find this a lesser sequel to Planet of the Apes, and six of the ten reviews are negative. Where praise exists, it gathers in two places: the production design of the underground mutant city, with its ruined New York landmarks, and the ending, which even the harshest notices concede is bold and bleak.
Reservations centre on everything before that finale. Several critics see the first half as a clunky rehash of the original, reusing sets and plot beats on a reduced budget, with Charlton Heston barely present. The telepathic mutants and their bomb cult are called schlocky by some and heavy-handed by others; The New Yorker objects to the film lecturing on imperialism and the Bomb rather than satirising anything. The spread is wide. The contemporary notices from 1970 are the most hostile, while later writers at HeyUGuys and Film Stories rate it a brave, imaginative sequel, and Radio Times calls it the best of the follow-ups.
