Star Trek IV: The Voyage Home was the fourth movie set in the Star Trek universe. It was made in 1986 by Paramount Pictures.
James T. Kirk and his crew have to travel back in time in a Klingon space ship to save the Earth from an alien probe attempting to contact now-extinct humpback whales. The crew travel to the 20th century, in order to find the whales and take them to the 24th century, so they can answer the probe's call.