Stardate 50564.2: Worf and Garak, who travelled through the wormhole to find the source of Enabran Tain's message, are captured by the Jem'Hadar and brought to an internment camp. There, Garak is reunited with Tain before the old Obsidian Order leader dies. Meanwhile, Deep Space Nine monitors Starfleet listening beacons go down one by one. Fearing that a Dominion attack is imminent, Captain Sisko prepares to close the wormhole permanently. However, a saboteur destroys the pulse that would close the wormhole. Seconds after the pulse dies out, Dominion warships enter the Alpha Quadrant.
        s05e01 - Apocalypse Rising
          
        
      
    
        s05e02 - The Ship
          
        
      
    
        s05e03 - Looking for par'Mach in All the Wrong Places
          
        
      
    
        s05e04 - ... Nor the Battle to the Strong
          
        
      
    
        s05e05 - The Assignment
          
        
      
    
        s05e06 - Trials and Tribble-ations
          
        
      
    
        s05e07 - Let He Who is Without Sin...
          
        
      
    
        s05e08 - Things Past
          
        
      
    
        s05e09 - The Ascent
          
        
      
    
        s05e10 - Rapture
          
        
      
    
        s05e11 - The Darkness and the Light
          
        
      
    
        s05e12 - The Begotten
          
        
      
    
        s05e13 - For the Uniform
          
        
      
    
        s05e14 - In Purgatory's Shadow (1)
          
        
      
    
        s05e15 - By Inferno's Light (2)
          
        
      
    
        s05e16 - Doctor Bashir, I Presume?
          
        
      
    
        s05e17 - A Simple Investigation
          
        
      
    
        s05e18 - Business as Usual
          
        
      
    
        s05e19 - Ties of Blood and Water
          
        
      
    
        s05e20 - Ferengi Love Songs
          
        
      
    
        s05e21 - Soldiers of the Empire
          
        
      
    
        s05e22 - Children of Time
          
        
      
    
        s05e23 - Blaze of Glory
          
        
      
    
        s05e24 - Empok Nor
          
        
      
    
        s05e25 - In the Cards
          
        
      
    
        s05e26 - Call to Arms
          
        
      
    When the Cardassian occupation of Bajor ended in 2369, the mining space station Terok Nor was left abandoned, its systems ripped out. By invitation of the Bajoran provisional government, Starfleet stepped in to oversee the rebuilding and day-to-day operations of the newly christened Deep Space Nine. 
The years of Starfleet's nonintervention into Cardassian matters, however, had taken its toll on relations with the Bajorans. Consequently, Starfleet's position was a tenuous one; many Bajorans, suspicious and hostile as a result of decades of Cardassian oppression and brutality, did not greet the Federation's presence with open arms. The Federation's assistance is put to the test as DS9 becomes a center of travel and commerce that stretches into the Gamma Quadrant.