When something threatens the viability of the Wormhole, disrupting passage through this vital transport link, the fabled USS Enterprise is dispatched to the scene. Captain Jean-Luc Picard and Commander Benjamin Sisko must combine forces to find out whether the mysterious force behind the Wormhole is a natural phenomenon, or whether the Cardassians are behind it? The full casts of both series meet and intermingle as the story unfolds, leading to fascinating relationships.