Star Trek IV: The Voyage Home 1986

To save Earth from an alien probe, Admiral James T. Kirk and his fugitive crew go back in time to San Francisco in 1986 to retrieve the only beings who can communicate with it: humpback whales.

When a mysterious alien probe threatens to obliterate Earth, Captain Kirk and his ragtag crew must pull off the ultimate heist—traveling back to 1986 San Francisco to rescue the one species capable of stopping the threat: humpback whales. Racing against time and battling 20th-century obstacles, these futuristic misfits discover that the key to humanity's survival lies in an unexpected alliance with nature's most majestic creatures.