Kirk returns to the planet where he spent time 13 years before. A friend from his previous visit is now leader of his people. While trying to uphold the Federation's prime directive, the Klingons are providing more advanced technology to their enemies. Written by
Did You Know?
(1966) has been known to tackle societal, political, environmental, and other types of issues throughout the history of the franchise. This particular episode tackled the Vietnam War head-on, not only by referencing it as the "20th-Century brush wars on the Asian continent", but also as portraying the Federation and the Klingon Empire as superpowers using an otherwise peaceful world as pawns in their struggle for power (a direct allegory of the Cold War at that time). See more
The ape-like creature is referred to throughout as a "Mugato". However, in the closing credits, actor/stuntman Janos Prohaska
(who played the creature) is credited as "The Gumato" (see Trivia section). See more
There's an old custom among my people: When a woman saves a man's life, he is grateful.
Referenced in Zoolander