 Cardassian technology isn t as good as it seems. Chief O Brien is very very busy as systems all over the station are failing. While Trying to free people stuck in an airlock and promising a ship s captain a repair crew by the end of the day, Dax wants him to repair a malfunction in the lab. Then he must repair the navigational computer for Kira, only to be ordered by Sisko to make sure he gets good coffee by fixing the replicators. A while later all of the sudden O Brien has become aphasic. Bashir has no clue what happened, there seems to be nothing wrong physically with him. Then out of the blue Dax also turns aphasic, right in front of his eyes. All over the ship people are displaying the symptoms, it seems an epidemic caused by a virus.