1. "Last episode" of the entire Lord of the Rings story:
There is no single "last episode" for the entire Lord of the Rings story. It's a large, multi-part work:
* The Hobbit: A prequel to the Lord of the Rings, published in 1937.
* The Lord of the Rings: The main story, published in three volumes in 1954-1955.
* The Silmarillion: A collection of myths and legends about the history of Middle-earth, published in 1977 after Tolkien's death.
* Unfinished Tales: A collection of Tolkien's writings about Middle-earth, published in 1980.
* The Adventures of Tom Bombadil: A collection of short stories set in Middle-earth, published in 1962.
2. "Last episode" of the most recent Lord of the Rings television series:
The most recent Lord of the Rings television series is The Lord of the Rings: The Rings of Power, which premiered in 2022. As of November 2023, it has been renewed for a second season, but the number of seasons and the final episode haven't been confirmed yet.
It's important to note that there are other Lord of the Rings adaptations, such as the Peter Jackson film trilogy, but they are not considered part of the ongoing television series.