A well-written, well-acted episode without any of the goofiness you find in some ST episodes.
I think "Balance Of Terror" was one of the best.Agreed.A well-written, well-acted episode without any of the goofiness you find in some ST episodes.
It was a loose adaptation of a World War 2 movie about a US Navy Destroyer vs a German submarine.

Balance of Terror was one of the best episodes.
Return of the Archons was good, as was Plato’s Stepchildren.

"Balance of Terror", written by Paul Schneider and directed by Vincent McEveety, is the fourteenth episode of the first season of the original science fiction television series, Star Trek, that first aired on December 15, 1966. It was repeated on August 3, 1967. The episode is a science-fiction version of a submarine film; writer Paul Schneider drew on the film The Enemy Below, casting the Enterprise as the American destroyer and the Romulan vessel as the German submarine.

The Enemy Below is a 1957 war film which tells the story of the battle between the captain of an American destroyer escort and the commander of a German U-boat during World War II. The movie stars Robert Mitchum and Curt Jürgens and was directed and produced by Dick Powell. The film was based on a novel by Denys Rayner, a British naval officer involved in anti-submarine warfare throughout the Battle of the Atlantic.
This was directed by Dick Powell, a very over looked 1930s silver screen crooner turned "Tough Guy" actor turned Director/Producer. Was married to both Joan Blondell and June Allyson. Much maligned for producing & directing 1956'sThe Conqueror starring John Wayne as Genghis Khan. Exteriors shot near St. George, Utah, downwind of the United States government's Nevada National Security Site where 11 A-Bomb test took place in 1953.

This caused a Cancer Controversy: Powell died of cancer in January 1963, seven years after the film's release. Armendáriz was diagnosed with kidney cancer in 1960, and killed himself in June 1963 after he learned his condition had become terminal. Hayward, Wayne, and Moorehead all died of cancer in the 1970s. Hoyt died of lung cancer in 1991. Skeptics point to other factors such as the wide use of tobacco Wayne and Moorehead in particular were heavy smokers, and Wayne himself believed his lung cancer to have been a result of his six-packs-a-day cigarette habit.[12] The cast and crew totaled 220 people. By the end of 1980, as ascertained by People magazine, 91 of them had developed some form of cancer and 46 had died of the disease. Several of Wayne and Hayward's relatives who visited the set also had cancer scares. Michael Wayne developed skin cancer, his brother Patrick had a benign tumor removed from his breast, and Hayward's son Tim Barker had a benign tumor removed from his mouth.
The film...
is a hoot to watch!
I feel this Tartar woman is for me, and my blood says, take her...
There are moments for wisdom and moments when I listen to my blood; my blood says, take this Tartar woman.
Back off, Duke-- My heart is reserved...
for Bendy when I grow up!
https://upload.wikimedia.org/wikipedia/commons/0/0f/The_Conqueror_%281956%29_film_poster.jpg