Noun
balance of terror
(historical) The tenuous peace that existed during the nuclear arms race between the United States and the Soviet Union during the Cold War.
Nuclear weapons offer us nothing but a balance of terror, and a balance of terror is still terror. George Wald
However, the nameless Centurion in TOS's " Balance of Terror " seems to be a senior officer who holds sway with his commander, having served on more than 100 campaigns with him. Source: Internet
In the original series episode " Balance of Terror ", Spock notes that while the events during the period of Surak are well documented (as per episodes that detail such like " The Savage Curtain "), he is uncertain about their connections to the Romulans. Source: Internet
Remus A sister planet or nearby solar system labeled "Romii" appeared on a star map in the original series episode " Balance of Terror ", the first episode to feature the Romulans. Source: Internet
The first episode to be released to syndication was " Balance of Terror " on the weekend of September 16, 2006. Source: Internet