Star Trek: Deep Space Nine 5: Babel (1993)

Shortly after O'Brien is assigned to service the food replicators, Deep Space Nine falls victim to a mysterious and fatal virus. O'Brien, of course, is not responsible; the virus, long dormant, had been placed in the station's system years earlier to disable the Cardassians. Kira races against time to find an antidote, her task made doubly difficult by the fact that the virus renders its victims unable to communicate. First aired January 23, 1993, "Babel" was scripted by Michael McGreevey and Naren Shankar from a story by Sally Caves and Ira Steven Behr. ~ Hal Erickson, All Movie Guide