The USS Enterprise NCC-1701, under the command of Captain James T. Kirk, visited the planet Nibiru. A volcano was about to erupt. Commander Spock, the Enterprise's first officer, went down to stop the volcano from erupting. Spock's life was jeopardized and Captain Kirk violated the Prime Directive to save Spock's life. In the process, he exposed the USS Enterprise to the Nibirians, who worshipped the Federation starship as a god. Spock was rescued by the Enterprise and the cold fusion bomb rendered the volcano inert. The Enterprise went back to Earth. Kirk and Spock were summoned to Admiral Christopher Pike's office. After dismissing Spock, Admiral Pike admonished Kirk for violating the Prime Directive and told him that Starfleet relieved Kirk of command of the Enterprise and that Kirk was