Fifth planet (hypothetical) into the Sun. Unlike the Disruption Theory's fifth planet, "Planet V" is not credited with creating the asteroid belt. The concept of a fifth planet which had been destroyed to make the asteroid belt, as in the Disruption Theory, has been a popular one in fiction. Fifth planet (hypothetical) In the history of astronomy, a handful of Solar System bodies have been counted as the fifth planet from the Sun. Under the present definition of a planet, Jupiter is counted as the fifth. There are three main ideas regarding hypothetical planets between Mars and Jupiter. During the early 19th century,
Escape from the Planet of the Apes the second. A new character of Dr. Milo is introduced played by actor Sal Mineo, who hoped his career would gain from the new project much as McDowall's career had from participating in the first film. Charlton Heston, star of the first film and supporting actor in the second, appears in this third installment only in two brief flashback sequences. Despite "Beneath the Planet of the Apes" ending in a way that seemed to prevent the series from continuing forward, 20th Century Fox still wanted a sequel. Roddy McDowell, in the franchise documentary "Behind the Planet of the Apes", stated