Doppelgänger

Doppelgängers were individuals who were identical to other individuals.

Coincidental doppelgängers

 * Abbot of Amboise, Robert Bellarmine and the First Doctor. (DW: The Massacre) (MA: The Empire of Glass)
 * Ramón Salamander and the Second Doctor. (DW: The Enemy of the World)
 * Strella and Romana I. (DW: The Androids of Tara)
 * Ann Talbot and Nyssa. (DW: Black Orchid, MA: The Sands of Time)
 * Peri and Queen Anne (but Queen Anne had a crooked nose). (BFA: The Church and the Crown)
 * William Pike and his great-grandson Darius Pike. (K9TV: The Cambridge Spy)
 * Barker and his great-grandson Thorne. (K9TV: The Cambridge Spy)
 * Gwyneth and Gwen Cooper. (DW: Journey's End)

The last three cases may have been a result of spatial genetic multiplicity.

Deliberate doppelgängers

 * The Daleks created a robot double of the First Doctor. (DW:The Chase)
 * The Chameleons adopted the appearance of several people including Polly. (DW:The Faceless Ones)
 * General Scobie came face-to-face with his Auton replacement. (DW: Spearhead from Space)
 * Bill Filer was duplicated by Axos. (DW:The Claws of Axos)
 * The Zygons impersonated several people including Harry Sullivan. (DW:Terror of the Zygons)
 * The Fourth Doctor, Sarah Jane Smith, Sergeant Benton, and Harry Sullivan were all duplicated as robots by the Kraals. (DW: The Android Invasion)
 * The Fourth Doctor and Leela were cloned. (DW:The Invisible Enemy)
 * Prince Reynart's robot double was crowned king in his place. (DW: The Androids of Tara)
 * Cessair of Diplos created an image of the Doctor that caused Romana to fall over the edge of a cliff.(DW: The Stones of Blood)
 * Romana II chose to take on the appearance of Astra of Atrios when she regenerated. (DW: The Armageddon Factor and Destiny of the Daleks)
 * Meglos and the Fourth Doctor (DW: Meglos)
 * Omega and the Fifth Doctor. (DW: Arc of Infinity)
 * Kamelion took on the form of King John of England and momentarily, the Fifth Doctor, the Master and Tegan Jovanka. (DW: The King's Demons)
 * The Daleks created multiple duplicates, Stien amongst them. (DW: Resurrection of the Daleks)
 * Sharaz Jek created android doubles of Major Salateen, the Doctor and Peri. (DW: The Caves of Androzani)
 * A Kymbra Chimera took on the form of the Sixth Doctor and Peri Brown while in the Doctor's TARDIS. (DWM: Changes)
 * Dr. Who and the Seventh Doctor. (NA: Conundrum, Head Games)
 * A clone of the Sixth Doctor. (BFA: Project: Lazarus)
 * The Autons created a duplicate of Mickey Smith. (DW: Rose)
 * Martha Jones was cloned by the Sontarans. (DW: The Sontaran Stratagem)
 * Drake created a duplicate of K9.(K9TV: Jaws of Orthrus)
 * The Autons created a duplicate of Rory Williams. (DW: The Pandorica Opens/The Big Bang)
 * Gwyneth's genetic traits were passed through the Cardiff Space-Time Rift via spatial genetic multiplicity, to her distant relative Gwen Cooper. (DW: The Stolen Earth)
 * The Flesh was used to make clones of workers at an acid factory. These clones were called Gangers. The Eleventh Doctor was himself cloned by the Flesh. (DW: The Rebel Flesh)
 * The Justice Department Vehicle known as the Teselecta took the form of Rasputin with green skin. In 1938 Berlin, it took the form of a janitor, a Nazi official, a Nazi soldier (both with and without a motorbike), Amy Pond, and River Song. (DW: Let's Kill Hitler)

People meeting themselves

 * The TARDIS crew saw a potential future versions of themselves as exhibits. (DW: The Space Museum)
 * The Third Doctor and Jo Grant met themselves due to a temporal paradox. (DW: Day of the Daleks)
 * The Third, Second and First Doctor (DW: The Three Doctors)
 * The Fifth, First, Third and Second Doctor. (DW: The Five Doctors)
 * The Sixth and Second Doctor. (DW: The Two Doctors)
 * The Tenth and Fifth Doctor. (DW: Time Crash)
 * The Fifth, Sixth and Seventh Doctor (BFA: The Sirens of Time)
 * The Fifth and Seventh Doctor. (MA: Cold Fusion)
 * Eighth Doctor meeting his previous selves. (EDA: The Eight Doctors)
 * The Eighth Doctor and the Relic. (EDA: Alien Bodies)
 * The Master and Koschei (from an alternate universe). (PDA: The Face of the Enemy)
 * The Brigadier (1977) and The Brigadier (1983). (DW: Mawdryn Undead)
 * Fitz Kreiner and Father Kreiner. (EDA: The Ancestor Cell)
 * Jason Kane and his clone. (NA: Happy Endings)
 * Mickey Smith met, and eventually replaced, his parallel-world counterpart (Ricky Smith). (DW: Rise of the Cybermen / The Age of Steel)
 * The Ninth Doctor and Rose Tyler travelled back in time to the day her father died. They later travelled back once again and saw themselves. (DW: Father's Day)
 * Amy Pond and Rory Williams saw their future selves observing them from afar. (DW: The Hungry Earth)
 * In the National Museum Amy Pond met herself as a child and the Eleventh Doctor met a future version of himself. (DW: The Big Bang)

Stolen Bodies
Not quite real doppelgängers are the times that bodies are invaded and taken over by another being, but the principle of looking like someone else remains.


 * The Master stole the body of Tremas. (DW: The Keeper of Traken)
 * The Master stole the body of Bruce. (DW: Doctor Who)
 * Fenric stole the bodies of Judson and Sorin. (DW: The Curse of Fenric)
 * A Butterfly Person stole the body and identity of a prostitute called Mary. (TW: Greeks Bearing Gifts)
 * The Slitheen family used compression fields to wear the skins of other forms of life and take their places. (DW: Aliens of London / World War Three, Boom Town, NSA: The Monsters Inside, SJA: Revenge of the Slitheen, The Lost Boy)
 * The Blathereen family used stolen Slitheen compression fields to take the places of several personnel on the prison planet Justicia. (NSA: The Monsters Inside)
 * As a bodiless entity Cassandra O'Brien.Δ17 temporarily possessed the bodies of the Tenth Doctor, Rose Tyler, and Chip. (DW: New Earth)
 * The Beast stole the body of Tobias Zed and posed as him. (DW: The Impossible Planet/The Satan Pit)
 * The Family of Blood took living bodies as hosts. (DW: Human Nature / Family of Blood)
 * The Aubertide could assume the appearance of anything or anyone they ate. (NA: Human Nature)
 * An Isolus once possessed a young girl named Chloe Webber and acted through her. (DW: Fear Her)
 * The Flood was capable of permanently inhabiting and controlling the body of seemingly any living organism it came in physical contact with. (DW: The Waters of Mars)

Other

 * The Third Doctor travelled to a parallel universe and encountered other versions of Alistair Gordon Lethbridge-Stewart, Liz Shaw, and John Benton. (DW: Inferno)
 * The Tenth Doctor travelled to a parallel universe and encountered other versions of Mickey Smith, Jackie Tyler, Pete Tyler, and the Cybermen. (DW: Rise of the Cybermen)
 * Zagreus and the Eighth Doctor (BFA: Neverland, Zagreus)
 * Townsend, Tepesh, and Winky were projections of the Seventh, Sixth, and Fifth Doctors (BFA: Zagreus)
 * The Tenth Doctor transferred his regeneration energy to his hand, and when Donna Noble touched it, she created a clone of the Doctor. (DW: Journey's End)