Venusian aikido Venusian aikido ( sometimes called Venusian karate ) was an unarmed combat style used frequently by the Third Doctor to defend himself and others . Nature . According to one account , it was created by the Venusian s on Venus , which meant it worked best with five arms and five legs . ( PROSE : " First Frontier " ) Another account stated that the Doctor himself invented it . ( PROSE : " Interference - Book One " ) It could be used to immobilise an opponent by using pressure points ( TV : " The Mind of Evil " , " Inferno " ) and perform joint locks , throws and kicks . ( TV : " The Claws of Axos " ) It tended to use the attacker ' s own movements against them . ( PROSE : " Freedom " ) These were effective against many different humanoid species , but were useless against non - human duplicates and seemed to have no effect on Ogron s or Sontaran s . ( TV : " The Claws of Axos " , " Day of the Daleks " , " The Time Warrior " ) Notable uses . The Doctor . The Second Doctor learned the arts of Venusian Aikido whilst on Venus with Jamie McCrimmon and Victoria Waterfield . ( AUDIO : " Voyage to Venus " ) The Third Doctor used it to disable Professor Stahlman . He claimed that , if the move was held for a period , it would paralyse the target permanently . ( TV : " Inferno " ) The Third Doctor tried to use Venusian Aikido against Primord s . When this didn ' t work he moved on to Martian karate , but this had no effect either . ( PROSE : " Inferno " ) The Third Doctor was also forced to use Venusian Aikido against several Sea Devils . ( TV : " The Sea Devils " ) The Third Doctor used his knowledge of Venusian martial arts to defend himself against attacking Uxariean s . ( TV : " Colony in Space " ) The Third Doctor used Venusian Aikido to subdue Varan when he was attacked whilst trying to escape the Skybase ( TV : " The Mutants " ) The Third Doctor also proved himself a formidable opponent using Venusian martial arts against several guards . ( TV : " The Green Death " ) The Third Doctor also tried to use Venusian Aikido against Jingo Linx , but it proved to be ineffective . ( TV : " The Time Warrior " ) The Third Doctor again employed Venusian Aikido when he was forced to fight several Exxilons on the planet Exxilon when they tried to capture him . ( TV : " Death to the Daleks " ) The Third Doctor used Venusian Aikido against Remoraxian s . ( COMIC : " In With the Tide " ) The Third Doctor used Venusian Aikido to disable the hypnotised Ned . ( COMIC : " The Celluloid Midas " ) The Fifth Doctor used Venusian Karate against Adric . ( PROSE : " First Born " ) In an attempt to trick Curatrix Zennox and stop her from completing her plan to bring back the Cybermen , the Sixth Doctor claimed that he used Venusian Karate to overpower Jamie McCrimmon . She thought he was making that up . ( AUDIO : " Last of the Cybermen " ) The Eighth Doctor , despite his amnesia , remembered a Venusian Aikido lesson and used it against Mo . ( PROSE : " The Eight Doctors " ) The Eighth Doctor used Venusian Aikido against C ' rizz to stop him from strangling Charley , although the Doctor later admitted that he was out of practice . ( AUDIO : " Faith Stealer " ) The Eighth Doctor used Venusian Aikido to defend himself against Destrii . ( COMIC : " Ophidius " ) The Twelfth Doctor used Venusian aikido on Abesse after she repeatedly attacked him in the Prison canteen . He stated that he didn ' t use it on ladies as a general rule , but that Abesse wasn ' t a lady . ( PROSE : " The Blood Cell " ) The Twelfth Doctor used Venusian aikido on Robin Hood to knock his sword from his grip . ( TV : " Robot of Sherwood " ) The Twelfth Doctor used Venusian aikido on Jorj , successfully flipping him to the ground , knocking him out . ( TV : " World Enough and Time " ) Others . Sarah Jane Smith knew Venusian Karate . ( TV : " A Girl ' s Best Friend " ) River Song learned Venusian martial arts from the Venusian Martial Arts Academy on one of her honeymoons because she misread the brochure . ( AUDIO : " The Sonomancer " )