Star Trek IV: The Voyage Home is a 1986 American science fiction film released by Paramount Pictures. It is the fourth feature film based on Star Trek, and a sequel to the 1968–1969 Star Trek television series. It completes the story arc begun in The Wrath of Khan and continued in The Search for Spock. Intent on returning home to Earth to face trial for their perceived crimes, the former crew of the USS Enterprise finds the planet in grave danger from an alien probe attempting to contact now-extinct humpback whales. The crew travel to Earth's past to find whales who can answer the probe's call.