Star Trek: The Original Series: The Weight of Worlds

The "Enterprise" responds to an urgent distress call from a mining colony orbiting Klondike VI, a ringed gas giant not unlike Saturn. For unknown reasons, the planet's rings are coming apart, threatening the safety of the colony and its inhabitants. Searching for a way to avert the disaster, Captain James T. Kirk and his crew investigate a mysterious alien probe that has just entered the system. Original.