"Visionary" is the 17th episode of the third season of "Star Trek: Deep Space Nine," originally aired on February 27, 1995. In this episode, Chief Miles O'Brien experiences involuntary time shifts into the near future after a radiation accident. These jumps reveal alarming events, including his own death and the potential destruction of Deep Space Nine. Simultaneously, a Romulan delegation arrives on the station, seeking intelligence on the Dominion. O'Brien's visions uncover a Romulan plot to destroy the station and the wormhole to prevent a Dominion threat. With this foreknowledge, the crew thwarts the Romulans' plan, ensuring the station's safety. The episode masterfully combines suspense with intricate storytelling, showcasing O'Brien's resilience and the crew's unity in the face of temporal anomalies and political intrigue. The depiction of time travel's complexities and the moral dilemmas of preemptive defense add depth to the narrative, making "Visionary" a standout episode in the series.