Web of the Romulans, Star Trek: The Original Series

Ravaged by a killer virus, the Romulans enter Canara, where the only antidote can be found. Desperate, they incite a victorious Enterprise attack on one of their vessels -- but Kirk discovers their ruse. Meanwhile the central computer has fallen in love with him severly cripling the Enterprise. Now Kirk must bring the antidote to the Romulans -- before the galaxy crashes over the brink of war!