The character played by Roddy McDowall in the film 'Planet of the Apes' was Cornelius. 'Planet of the Apes' is a 1968 American science fiction film directed by Franklin J. Schaffner and loosely based on the 1963 French novel 'La Planète des Singes' by Pierre Boulle.

The plot concerns an astronaut crew that crash-lands on a strange planet in the distant future. Although the planet appears desolate at first, the surviving crew members stumble upon a society in which apes have evolved into creatures with human-like intelligence and speech. The apes have assumed the role of the dominant species and humans are mute creatures wearing animal skins.

The film was released in the United States on February 8, 1968, and was a commercial success, earning a lifetime domestic gross of $32.6 million. The film was groundbreaking for its prosthetic makeup techniques and was well received by critics and audiences, launching a film franchise, including four sequels, as well as a short-lived television show, animated series, comic books, and various merchandising. In particular, Roddy McDowall (17 September 1928 – 3 October 1998) had a long-running relationship with the Apes series, appearing in four of the original five films (absent, from the second film of the series, 'Beneath the Planet of the Apes', in which he was replaced by David Watson in the role of Cornelius), and also in the television series.

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