Star Trek IV is considered by some the last episode of the so-called "Star Trek Trilogy". The trilogy consists of the movies II, III and IV, which are linked plotwise. In order to know what the beginning is all about, you should watch parts II and III first. The film is directed and partly written by Leonard Nimoy, better known as Mr. Spock. He also directed the earlier Star Trek movie. It's entertaining, I give it that. We get a very unlikely but interesting plot. An alien probe has come to Earth, communicating only with the songs of the extinct-in-the-23rd-century humpback whales. The signals the probe sends are so powerful that they're ionizing the atmosphere and threatening all life on Earth. Kirk must go back in time to get some whales. The time travel sequence feels pretentious. Well, end up in the 1980's, it seems, and this is the best part of the movie. Although it's the ancient alien-in-a-foreign-land scenario, with very basic jokes, it ha...