The Monk ' s TARDIS The Monk ' s TARDIS was a Mark IV TARDIS . History . Unlike the First Doctor ' s TARDIS , at this time the Monk ' s TARDIS had a functional chameleon circuit , directional unit and an automatic drift control . Its control console was also set on a dais , as opposed to being at floor level . After visiting several moments in Earth history , where he collected valuable pieces of art , he landed in Northumbria in 1066 and disguised his ship as a Saxon sarcophagus in an abandoned monastery . The Doctor learned of the Monk ' s plans to change history and sabotaged his TARDIS by taking the dimensional control , making it the same size inside as outside . This made it impossible for the Monk to get inside it . ( TV : " The Time Meddler " ) The Monk eventually managed to fix the dimensional control s , re - creating the interior dimensions , and thus escape from 1066 . On a later adventure on the volcano planet Tigus , Mortimus ' s ship turned into a large rock . Meeting again in ancient Egypt , the First Doctor changed it into a police box so Mavic Chen and the Dalek s would mistake it for the Doctor ' s TARDIS . During the Doctor ' s reprogramming of the chameleon circuit of the Monk ' s TARDIS , the ship briefly took the forms of a motorbike , a Western covered wagon and a World War II tank . He also stole the Monk ' s directional unit so the Monk would re - materialise in a random location . The Monk ended up in an frigid planet with his TARDIS disguised as a block of ice . ( TV : " The Daleks ' Master Plan " ) When the Fifth Doctor next encountered the Monk , he appeared to have voluntarily re - configured his TARDIS into a police box . The Monk had the top of his ship ' s roof blown off by Ice Warrior s with a sonic cannon . ( COMIC : " 4 - Dimensional Vistas " ) The Seventh Doctor met the Monk in London in 1976 . Mortimus , posing as a record executive , had turned his ship into a desk , complete with scraps of paper . The papers retained some of the special qualities of his TARDIS , allowing the Doctor to use them to return to Earth after the Monk vengefully tried to abandon him on the same icy planet where he had been trapped . ( PROSE : " No Future " ) The Eighth Doctor , along with his new companion Tamsin Drew , had a reunion with the Monk in the Abbey of Kells in Ireland in the year 1006 . Under the alias of Abbot Thelonius , the Monk used the impressive artistic skills of the monks to draw a new directional circuit for his TARDIS , using a page of the Book of Kells and liquid Gallifrite . Unknown to the Monk , Tamsin had switched his circuit for a false one , prior to the first test of the circuit and again the Monk ' s TARDIS was crippled . However , the Monk was able to rectify this and had several more meetings with the Doctor . ( AUDIO : " The Book of Kells " ) When the Monk took Tamsin to the planet Halcyon in the 33rd century , his TARDIS assumed the form of a " Punch and Judy " tent . He told her that it could have taken the form of a tree which would have made it less conspicuous , but that would also have made it more difficult to find , given that it had materialised in a forest . ( AUDIO : " The Resurrection of Mars " ) Working with the human / Hetroden hybrid Sophia , the Monk was able to trick the Fifth Doctor into allowing history to be changed , giving the Monk the chance to step into the ' hole ' created in the timeline when the Time Lords took the Doctor away as punishment for his violation of the Laws of Time . As a result , the Monk began to travel in the Doctor ' s TARDIS , assuming the Doctor ' s role in history . However , realising that the Monk ' s actions were wrong , Sophia was able to draw the Fifth Doctor back into existence , allowing the Doctor to use the Monk ' s original TARDIS to set a trap that forced the Monk to restore the Doctor to his rightful place in history ( AUDIO : " The Secret History " ) .