The TARDIS arrives on the planet Vortis. There the Doctor and his companions discover and become involved in the plans of butterfly-like creatures (Menoptra) to reclaim their planet from a spidery parasite that is steadily enveloping it in a web-like structure. They join up with a party of Menoptra and their allies (the underground-dwelling Optera) and manage to destroy the parasite.
        s02e01 - Planet of Giants (1)
          
        
      
    
        s02e02 - Dangerous Journey (2)
          
        
      
    
        s02e03 - Crisis (3)
          
        
      
    
        s02e04 - World's End (1)
          
        
      
    
        s02e05 - The Daleks (2)
          
        
      
    
        s02e06 - Day of Reckoning (3)
          
        
      
    
        s02e07 - The End of Tomorrow (4)
          
        
      
    
        s02e08 - The Waking Ally (5)
          
        
      
    
        s02e09 - Flashpoint (6)
          
        
      
    
        s02e10 - The Powerful Enemy (1)
          
        
      
    
        s02e11 - Desperate Measures (2)
          
        
      
    
        s02e12 - The Slave Traders (1)
          
        
      
    
        s02e13 - All Roads Lead to Rome (2)
          
        
      
    
        s02e14 - Conspiracy (3)
          
        
      
    
        s02e15 - Inferno (4)
          
        
      
    
        s02e16 - The Web Planet (1)
          
        
      
    
        s02e17 - The Zarbi (2)
          
        
      
    
        s02e18 - Escape to Danger (3)
          
        
      
    
        s02e19 - Crater of Needles (4)
          
        
      
    
        s02e20 - Invasion (5)
          
        
      
    
        s02e21 - The Centre (6)
          
        
      
    
        s02e22 - The Lion (1)
          
        
      
    
        s02e23 - The Knight of Jaffa (2)
          
        
      
    
        s02e24 - The Wheel of Fortune (3)
          
        
      
    
        s02e25 - The Warlords (4)
          
        
      
    
        s02e26 - The Space Museum (1)
          
        
      
    
        s02e27 - The Dimensions of Time (2)
          
        
      
    
        s02e28 - The Search (3)
          
        
      
    
        s02e29 - The Final Phase (4)
          
        
      
    
        s02e30 - The Executioners (1)
          
        
      
    
        s02e31 - The Death of Time (2)
          
        
      
    
        s02e32 - Flight through Eternity (3)
          
        
      
    
        s02e33 - Journey into Terror (4)
          
        
      
    
        s02e34 - The Death of Doctor Who (5)
          
        
      
    
        s02e35 - The Planet of Decision (6)
          
        
      
    
        s02e36 - The Watcher (1)
          
        
      
    
        s02e37 - The Meddling Monk (2)
          
        
      
    
        s02e38 - A Battle of Wits (3)
          
        
      
    
        s02e39 - Checkmate (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...