The article discusses the significance of an episode of the popular TV show MASH, titled "Abyssinia, Henry." This episode is considered by many fans and critics to be the most important episode of the entire series. It features a shocking plot twist where one of the main characters, Colonel Henry Blake, is unexpectedly killed off. This event had a major impact on both the characters within the show and the viewers watching at home. The episode is praised for its emotional depth and realism, as it portrays the harsh realities of war and the sudden loss that can come with it. The death of Colonel Blake served as a turning point in the series, marking a shift towards a darker and more serious tone. Overall, "Abyssinia, Henry" is remembered as a pivotal moment in MASH's history, solidifying its status as a groundbreaking and influential television show.