Following these events and the destruction of the "Enterprise", Uhura joins her crewmates on a stolen Klingon ship amid a crisis on Earth in "". Traveling to the 20th century, they attempt to save a pair of humpback whales in order to repopulate the species. During a trip to San Francisco, Uhura and Pavel Chekov infiltrate the aircraft carrier USS "Enterprise" and use emissions from the carrier's nuclear reactor to recharge the Klingon vessel's power supply. Kirk and Spock then procure the whales so the crew can return to the 23rd century and save Earth.