
Slashfilm: "Star Trek IV Was Originally About Saving Something Much Smaller Than Whales: The makers of "The Voyage Home" revealed that they initially thought of a different endangered species to rescue, namely: the snail darter, a recently discovered fish that was about three inches long."
Slashfilm:
https://www.slashfilm.com/1549191/star-trek-iv-the-voyage-home-no-whales-snail-darters/
By Witney Seibold
"Nimoy liked the idea of saving the whales, but there was a bit of a creative difference. Harve Bennett had the idea, according to StarTrek.com, to make the small snail darter the object of the time traveler's hunt. Bennett felt that it would be more poetic if the fate of the Earth rested in the hands (fins?) of an overlooked, seemingly insignificant species. In "The Fifty-Year Mission," executive producer Ralph Winter recalls hearing Nimoy talking about the snail darter, and how it was kind of a terrible idea. Winter said:
>"It was Leonard's idea about saving the whales as opposed to, as he famously said, 'trying to save the snail darter.' Saving whales made it a bigger movie."
Indeed, saving whales made for a more dramatic story, as gathering them up and transporting them onto a starship required far more elaborate logistics. A small fry could merely be carried in a glass bowl.
Importantly, though, Leonard Nimoy wanted a lighter tone than the previous movies. He found an efficient ecology story, but he wanted to eschew the headiness of the first film, the action of the second, and the tragedy of the third. Nimoy said:
>"I just felt it was time to lighten up and have some fun. That meant that if we were going to do time travel, the best thing we could do was come back to contemporary Earth, where we could have some fun with our people. They would more or less be a fish out of water on the streets."
Nimoy's instincts were correct. Audiences loved "The Voyage Home." ... "
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https://www.slashfilm.com/1549191/star-trek-iv-the-voyage-home-no-whales-snail-darters/