Earth Day disaster movies

"Star Trek IV: The Voyage Home"

Credibility rating: 6

Movies don’t often deal with endangered animals, so even if the threat of extinction doesn’t hover as closely to humpback whales now as it did when “Trek” was first released in 1986, this sequel earns points for a sincere love of the animal kingdom. The time-travel premise—Kirk and the Enterprise crew venture to the 20th century to find extinct-in-their-time humpback whales in order to communicate with a dangerous alien probe—isn’t sound science, but the sight of Spock swimming with whales in an aquarium tank compensates for any quibbles.