Nibiru

Nibiru was a class M world that the was assigned to observe in 2259 of the Nero-created alternate reality (,, , Star Trek (App)).

It was determined that a volcano on the world was going to erupt and cause the extinction of the planet's species, notably the Nibiru. The Enterprise crew enacted a Prime Directive-defying plan to save the people by stopping the eruption with a cold fusion device. In doing so, the natives became aware of the ship and crew. This eventually led to Admiral chewing out Captain  and, while regaining control of the vessel with Kirk becoming his first officer.