Star Trek: The Original Series the 23rd century bearing a crew dedicated to exploring the Milky Way Galaxy. Roddenberry noted a number of influences on his idea, some of which includes A. E. van Vogt's tales of the spaceship "Space Beagle", Eric Frank Russell's "Marathon" series of stories, and the film "Forbidden Planet" (1956). Some have also drawn parallels with the television series "Rocky Jones, Space Ranger" (1954), a space opera which included many of the elements that were integral to "Star Trek"—the organization, crew relationships, missions, part of the bridge layout, and some technology. Roddenberry also drew heavily from C. S. Forester's Horatio Hornblower
Star Trek: The Original Series that have adopted period Earth cultures (Prohibition-era Chicago, Nazi Germany and ancient Greece, respectively). Two episodes depicting time travel ("Tomorrow Is Yesterday" and "") conveniently place "Enterprise" in orbit above 1960s Earth; a third ("The City on the Edge of Forever") places members of the crew on 1930s Earth. Several publications have ranked the ten best episodes of "Star Trek": In 1983, Leonard Nimoy hosted a one-hour special as a promotional tie-in with the film "", in which he recounted his memories of working on the original series and explained the origins of things such as the Vulcan nerve pinch