Star Trek IV: The Voyage Home: We Should Surrender to Evil Aliens
A giant alien probe shaped like a Twinkie starts vaporizing Earth's oceans and disrupting its electrical systems. As the planet's inhabitants struggle to recharge their communicators, Captain Kirk and his crew discover that the probe is trying to communicate with humpback whales, which had been killed off by humans 300 years earlier. It's clear that the Twinkie-probe will continue to microwave the Earth until it hears back from its whale friends, and so Kirk and company must travel back in time to find a non-extinct humpback. The lesson is clear: Stop killing whales, or you will be killed by a planetary-sized snack cake with a cetacean fetish (somewhere out there is a pornographic Tumblr devoted to just this scenario).
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Awww yeah, baby. Get yourself all wet.
Why It Falls Flat:
Look, there's a name for the sort of person who can make an environmental message movie that doesn't suck. And that name is Hayao Miyazaki. Most "save the environment" movies are just as likely to make viewers walk out of the cinema and set fire to a pile of refrigerators soaked in dolphin blood, just to discourage the director from making any more.
20th Century Fox