USS Enterprise, mighty God of all Nibirans

Nibiru was an M-class planet, and the homeworld of the Nibirans, a primitive pre-warp species. While the planet resembled tropical regions of Earth, it possessed red instead of green flora. It was also the home of an unknown species of docile quadruped mammals and large fish.
The USS Enterprise was sent to survey the planet in 2259, where the crew discovered a volcano was going to erupt and render all life on the planet extinct. Though the Prime Directive forbade interfering in the planet's natural history, Captain James T. Kirk decided to save Nibiru and its inhabitants.