Parasite

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A parasite was a species which acquired sustenance from a host organism, usually at the host's expense. The Doctor encountered several parasitic life forms in his travels.

Parasitic species

• Oraapi
• Werewolf
• Kroton (species)
• Family of Blood
• Mighty Jagrafess of the Holy Hadrojassic Maxarodenfoe
• Krynoid
• Nimon
• Wirrn
• Gelth
• Gorgon
• The Beast (The Taint)
• Torajii
• Axos
• Mayfly
• Sarricoid
• Weed Creature
• Time Beetle
• The Swarm (The Invisible Enemy)
• Gastropod
• Water Hag
• Ambition Parasite
• Scourge
• Vrall
• Droon
• Alien tapeworm
• Tactire
• Cerunnos
• The Flood (The Waters of Mars)
• Tumour alien
• Kiseibya
• Space Leech
• Mozhtratta
• Eknodine
• Psychic pollen
• Process
• Kera-Bera Beast
• Thought-form (SkyPoint)
• Aranjia
• Psionovore
• Magelnian Twort
• Qetesh
• Spulver worm
• Maker (Halflife)
• Ruin (species)
• Kyrolian
• Vampire
• Harmonelid
• Drill fly
• Lapino (species)
• Parasite (Submission)
• Brainspawn
• Silent
• Silhouette (species)
• Fearmonger
• Parasite (The Parasites)
• The Diadem
• Hellion
• Serfian
• Datavore
• Sou(ou)shi
• Arr'Chorrs
• Leech
• Iagnon
• Jalaphron
• Akhaten
• Red leech
• Shroud
• Threckon
• Speera
• Remoraxian
• Gulwort
• Pyralis
• Viruses
• Zaksyn
• Nurazh
• The Light (1963: The Assassination Games)
• Sild
• Wishing Beast
• Brain-worm
• Zalphon
• Bacchanite
• Species (Overture)
• Xenomorph
• Cerebravore
• Extron
• Nemonite
• Gaderene
• Fracture
• Nathemus
• Slinth
• Elysium parasite
• Harmony Shoal
• Dream parasites
• Forsaken
• Rempath
• Arn (species)
• Dryad
• Hirudine
• The Fat
• Thrake
• Emissary of Drakka
• Parasite (Love Rat)
• Thrusk
• Ichneumon wasp
• Cortex leech
• Spore (Iceberg)
• CEREBRA
• Red Entity
• Fuath
• Plant (Plant Life)
• Sentient book (Consequences)
• Dyzeps
• Now (species)
• Strid
• Dord
• Golem (The Art of Destruction)
• The Squall
• Krynoid (Lost in Time)
• Somlos berry
• Human
• Genetrix (Ruby Red)

Metaphorical parasites

The term "parasite" was sometimes used to describe persons who exploited others. Vicki called the Animus a parasite. (TV: The Web Planet) Mehendri Solon called the Time Lords "spineless parasites". (TV: The Brain of Morbius) The Fifth Doctor called the Eternals parasites. (TV: Enlightenment) The Eleventh Doctor called the Great Intelligence a parasite. (TV: The Snowmen)