DS9 Season 7 Episode 2 Shadows and Symbols

Plot

The Siskos are surprised by the young woman introducing herself as Ezri Dax, explaining she was the only unjoined Trill aboard the starship transporting the injured Dax symbiote back to Trill when it needed to be implanted immediately to survive. Benjamin Sisko invites Ezri to join him, his father Joseph, and his son Jake as they travel to Tyree to seek the Orb of the Emissary. Back at Deep Space Nine, Kira prepares a blockade to stop the Romulans from arming the weapons they have placed on Derna. Worf is joined by Jadzia's friends Miles O'Brien, Julian Bashir, and Quark on a mission led by the Klingon General Martok to destroy a Dominion shipyard in Jadzia's name.
The Siskos and Ezri arrive on Tyree. Guided by his visions, they begin a long trek across the desert. Eventually, Benjamin stops and digs on a seeming whim, while his father, son, and Ezri can only watch. He eventually unearths the Orb ark, but hesitates from opening it; he experiences visions of Benny Russell confined in a psychiatric hospital, as a doctor tries to persuade him to end the story of Benjamin Sisko. Sisko begins to bury the Orb, but Ezri convinces him to open it. When he does, an energy vortex is unleashed which re-opens the wormhole and expels the Pah-wraiths from it. Sisko experiences a vision in which one of the Prophets explains that she merged with Sisko's mother years ago to ensure Sisko's birth and the fulfillment of his destiny.
Against the advice of the Federation's Admiral Ross, Kira blockades Derna with old Bajoran ships, vastly outmatched by the firepower of the Romulans. Neither Kira nor the Romulans appear willing to back down, and seeing the wormhole reopen strengthens Kira's resolve. When he sees that Kira will not surrender, Ross persuades the Romulans to retreat.
On the Klingon ship, Worf is annoyed by the presence of O'Brien, Bashir, and Quark; eventually Martok reminds him to be grateful that Jadzia had such loyal friends, and he apologizes to them. When they reach the Dominion shipyard, they execute a plan to fly dangerously close to the sun and trigger a plasma ejection that will destroy the shipyard and illuminate the gates of Sto-vo-kor for Jadzia. The plan seems to fail when they are unable to trigger the plasma ejection, but they succeed on their second try and demolish the shipyard.
When Sisko returns to Deep Space Nine, the Bajoran people praise him for reopening the wormhole. His crew welcome him back, and are perplexed at the arrival of Ezri Dax.