What is the name of the ship stolen by the crew in Star Trek IV?

The ship stolen by the crew in Star Trek IV: The Voyage Home is the HMS Bounty. More precisely, it is a captured Klingon Bird of Prey that Kirk and his officers rename Bounty after taking control of it.

The vessel first appears at the end of Star Trek III: The Search for Spock, when the Enterprise crew seize it from Klingon forces. They use the ship to travel back from Vulcan to Earth, because the original Enterprise had been destroyed and the crew needed a spacecraft capable of making the journey.

In The Voyage Home, the Bounty is crucial to the whale-rescue mission. Its cloaking device lets Kirk and Spock hide the ship in San Francisco’s Golden Gate Park in 1986. The crew also uses it to transport two humpback whales into the future, hoping their song will answer the mysterious probe threatening Earth.

The name is a deliberate nod to HMS Bounty, the British sailing ship associated with the 1789 mutiny led by Fletcher Christian. A common mix-up is to answer “Klingon Bird of Prey,” which describes the ship’s class and origin, not the name Kirk’s crew gives it.