Shada ( prison ) Shada was the prison of the Time Lord locked in a bubble outside the universe ( PROSE : " Shada " ) for would - be conquerors of the universe . ( WC : " Shada " ) According to some accounts , it was a full prison planet ; ( COMIC : " The One " ) according to other accounts , it was just a planetoid or asteroid . ( PROSE : " Shada " , AUDIO : " Shada " ) Features . The prison was both locked in a bubble outside the universe and timelocked . ( PROSE : " Shada " ) It was contained by a quantum wall and its surface was patrolled by robot guardians . ( COMIC : " The One " ) The prisoners of Shada were stored each in their own separate cryogenic cell , alive , but frozen in time , in perpetual imprisonment . ( PROSE : " Shada " ) Prisoners had dragon tattoo s which snapped upon their release . ( PROSE : " Christmas on a Rational Planet " ) During the War , when the Great Houses began using their prison planet more often , War criminals began to fit themselves with ice - proof secondary nervous system s to help them in case they were sent there . Realising that this made it too easy to break out of cryogenics , the Great Houses started directly linking prisoners ' nervous systems into self - repeating time - frames through the convict tattoos on their upper right arms . ( AUDIO : " Movers " ) History . The villainous Skagra managed a successful jail break of the prisoner s while in search of Salyavin , the notorious Time Lord criminal who had developed a means of projecting his own thoughts into anyone ' s mind . Skagra believed that with this power , he could impose his own thoughts and will on the universe . Salyavin , though , had already escaped and was living a peaceful life as Professor Chronotis of the University of Cambridge . ( PROSE : " Shada " ) The Eleventh Doctor visited Shada in search of the Master ' s TARDIS . He entered by crashing the Then and the Now onto the quantum wall containing the prison . After landing , he remembered the planet ' s name . ( COMIC : " The One " ) Other notable prisoners . While searching for Salyavin , Skagra accessed the records of war criminal Rungar and mass - murderer Sabjatrik who were also prisoners in perpetuity . ( WC : " Shada " , AUDIO : " Shada " ) According to one account , Lady Scintilla was imprisoned in Shada for " conspiring with Carrionite s " . ( PROSE : " Shada " ) Shada held other renegade Time Lord s . The Master was imprisoned there , though he also escaped . This happened just before the Third Doctor ' s first confrontation with him since the latter ' s exile to Earth . ( PROSE : " Prisoners of the Sun " ) Daniel Joyce had the tattoo of a prisoner of Shada . ( PROSE : " Unnatural History " ) Grandfather Paradox was imprisoned on Shada . ( Legend had it that he had been imprisoned rather than executed because " everyone was more afraid of him dead than alive " . ) Early during Romana ' s Presidency , she suffered an epileptic fit under the influence of the Carnival Queen and signed an executive order freeing three hundred prisoners from Shada , including the Grandfather , who led the freed prisoners . ( PROSE : " Christmas on a Rational Planet " ) When Cousin Justine was tried and convicted by the ruling Houses , since she held the Grandfather ' s shadow , she was sent to the prison - world to finish the Grandfather ' s sentence . ( AUDIO : " In the Year of the Cat " ) However , she was rescued . ( AUDIO : " A Labyrinth of Histories " ) Devonire began his search for Grandfather Paradox ' s arm in the prison , and he was later imprisoned there in perpetuity . ( PROSE : " The Book of the War " ) The Heretic was either killed by the Time Lords or imprisoned on Shada after plotting to regenerate the universe . ( AUDIO : " The Two Masters " )