Ep 1. The City On the Edge of Forever

In the first episode of the Star Trek: The Original Series - Fan Favorites season 1, titled "The City On the Edge of Forever," the USS Enterprise is thrown back through time after passing through a strange time distortion. A landing party is sent down to a remote planet to search for a possible time portal, but when one of the crew members, Dr. McCoy, accidentally injects himself with a powerful drug, he goes berserk and escapes into the planet's past.

Captain Kirk and his crew follow Dr. McCoy back in time and find themselves in New York City during the year 1930, during the height of the Great Depression. While searching for McCoy, Kirk and his first officer, Mr. Spock, discover that a peaceful social worker named Edith Keeler may hold the key to their return to their own time.

As Kirk and Spock try to find a way to retrieve McCoy and return to 23rd century, they become embroiled in the lives of the people of 1930s New York City. They learn that Edith Keeler, an idealistic woman who runs a mission for the homeless, is a visionary leader who could change the course of history for the better. However, they soon discover that her fate is intertwined with their own, and that the survival of the Enterprise and its crew may depend on whether or not they can prevent her from dying at a crucial moment in time.

"The City On the Edge of Forever" is widely regarded as one of the best episodes of the original Star Trek series. This episode tackles themes of love, sacrifice, and the potential consequences of time travel in a compelling and thought-provoking way. It features standout performances from William Shatner and Leonard Nimoy as Kirk and Spock, as well as Joan Collins in a memorable guest role as Edith Keeler.

Overall, "The City On the Edge of Forever" is a classic episode that is beloved by fans of the series and science fiction in general. It explores complex ideas and emotions in a way that few other shows of its time were capable of doing, and remains a shining example of what the Star Trek franchise is capable of.