Salvaging Charlton Heston’s vessel, ape scientists Cornelius (Roddy McDowall), Zira (Kim Hunter), and Milo (Sal Mineo) travel back in space-time to 1970s earth, where they are delivered into the hands of sympathetic scientist Bradford Dillman and duplicitous presidential science advisor Eric Braeden. As the full implications of their existence become clear, the authorities must decide what to do with their simian guests. Ingeniously extending the series, this entry springs several surprises and puts more dramatic skin in the game.