here's a party on Deep Space Nine, as Sisko has just been promoted to captain. Ambassador Krajensky is in attendance, but, he's there to tell of a coup which just took place on the Tzenkethi home world. Krajensky wants to remind them the Federation is still committed to the protection of the colonies. Sisko takes the Defiant to Tzenkethi space. While working on the ship O'Brien hears some strange sounds, and soon the communications array malfunctions. O'Brien and Dax discover a parasitic tube-like system which is invading the ship's equipment, protected by a forcefield, which must be stopped before it takes full control leaving the crew to die.

Résumé de IMDb.com