Undoubtedly in example sentence
Undoubtedly one of the best episodes ever, Balance of Terror is 45 minutes of well executed suspense, with intelligent real-world parallels (the title refers to a situation very similar to what was going on between the US and the Soviet Union during the Cold War), spot-on characterizations and the introduction of Star Trek's second most important hostile alien race after the Klingons: the Romulans.