The TARDIS arrives some 10,000,000 years in the future on a giant spaceship. The ship is carrying all of the Earth's surviving plant, animal and human life (and is hence nicknamed The Ark) on a 700 year-long trip to a new home on the planet Refusis. The Doctors' companion Dodo has a head cold but the human Guardians of the ship, and their servant race the Monoids, have no resistance, and so a plague breaks out!! The Guardians place the travellers on trial and Steven has to defend them against the charge that they deliberately spread the disease. However, the Doctor finds a cure. The TARDIS leaves the spaceship only to arrive back there as it is approaching the end of its voyage. As a result of the earlier plague, the Monoids have now grown strong and enslaved the humans. They plan to make Refusis their own but the Doctor persuades the two races to live together in peace.
        s03e01 - Four Hundred Dawns (1)
          
        
      
    
        s03e02 - Trap of Steel (2)
          
        
      
    
        s03e03 - Air Lock (3)
          
        
      
    
        s03e04 - The Exploding Planet (4)
          
        
      
    
        s03e05 - Mission to the Unknown
          
        
      
    
        s03e06 - Temple of Secrets (1)
          
        
      
    
        s03e07 - Small Prophet, Quick Return (2)
          
        
      
    
        s03e08 - Death of a Spy (3)
          
        
      
    
        s03e09 - Horse of Destruction (4)
          
        
      
    
        s03e10 - The Nightmare Begins (1)
          
        
      
    
        s03e11 - Day of Armageddon (2)
          
        
      
    
        s03e12 - Devil's Planet (3)
          
        
      
    
        s03e13 - The Traitors (4)
          
        
      
    
        s03e14 - Counter Plot (5)
          
        
      
    
        s03e15 - Coronas of the Sun (6)
          
        
      
    
        s03e16 - The Feast of Steven (7)
          
        
      
    
        s03e17 - Volcano (8)
          
        
      
    
        s03e18 - Golden Death (9)
          
        
      
    
        s03e19 - Escape Switch (10)
          
        
      
    
        s03e20 - The Abandoned Planet (11)
          
        
      
    
        s03e21 - Destruction of Time (12)
          
        
      
    
        s03e22 - War of God (1)
          
        
      
    
        s03e23 - The Sea Beggar (2)
          
        
      
    
        s03e24 - Priest of Death (3)
          
        
      
    
        s03e25 - Bell of Doom (4)
          
        
      
    
        s03e26 - The Steel Sky (1)
          
        
      
    
        s03e27 - The Plague (2)
          
        
      
    
        s03e28 - The Return (3)
          
        
      
    
        s03e29 - The Bomb (4)
          
        
      
    
        s03e30 - The Celestial Toyroom (1)
          
        
      
    
        s03e31 - The Hall of Dolls (2)
          
        
      
    
        s03e32 - The Dancing Floor (3)
          
        
      
    
        s03e33 - The Final Test (4)
          
        
      
    
        s03e34 - A Holiday for the Doctor (1)
          
        
      
    
        s03e35 - Don't Shoot the Pianist (2)
          
        
      
    
        s03e36 - Johnny Ringo (3)
          
        
      
    
        s03e37 - The O.K. Corral (4)
          
        
      
    
        s03e38 - The Savages (1)
          
        
      
    
        s03e39 - The Savages (2)
          
        
      
    
        s03e40 - The Savages (3)
          
        
      
    
        s03e41 - The Savages (4)
          
        
      
    
        s03e42 - The War Machines (1)
          
        
      
    
        s03e43 - The War Machines (2)
          
        
      
    
        s03e44 - The War Machines (3)
          
        
      
    
        s03e45 - The War Machines (4)
          
        
      
    Doctor Who is the longest-running science fiction TV series in history, airing initially from 1963 to 1989. Doctor Who is about ideas. It pioneered sophisticated mixed-level storytelling. Its format was the key to its longevity: the Doctor, a mysterious traveller in space and time, travels in his ship, the TARDIS. The TARDIS can take him and his companions anywhere in time and space. Inevitably he finds evil at work wherever he goes...