Midnight entity The Midnight entity was a lifeform living on the planet Midnight . It was one of the few beings that the Doctor had no knowledge of at all , which , given his expansive , encyclopaedic knowledge of the universe and everything in it across time , was a testament , possibly due to its obscurity , or its innovation to adapt . The creature was never given a name , nor did it display any form other than a shadow running across the landscape . Biography . During the Crusader Tours to the Sapphire Waterfall , a tour bus had apparently broken down . While looking out a window , the on - board trainee mechanic , Claude , noticed a shadow among the diamonds that was moving in the distance , " running " towards them . Following the beginning of the passengers ' paranoia , the entity knocked twice around the bus to get everyone ' s attention . When Mr Cane and the Tenth Doctor knocked a different number of times , the entity mimicked the pattern exactly . Following Sky Silvestry ' s hysterical blathering , the entity closed in on her from the outside and somehow entered the shuttle without any sign of a hole , while ripping off the cockpit , killing the drivers . In the following blackout from the loss of the main generator , the entity chose to possess Sky . The entity seemed to gather the strength of its host and then repeated every word a person said in exact precision , including the square root of pi to 30 decimal places . Eventually , the entity copied word - for - word at the exact same time , focusing on the Doctor , and eventually stealing his voice , paralysing him and forcing him to repeat after her . Taking advantage of the hysterical level of paranoia that was already amongst the passengers , the entity convinced them that the Doctor was now possessed and needed to be thrown off the bus . However , while Professor Hobbes and Mr Cane were trying to get rid of the Doctor , the entity made a grave mistake - it began using phrases that the Doctor had previously said , prompting the attention of only the hostess . The entity was helpless as the hostess sacrificed herself to drag it out into the X - tonic light , vaporising both of them to free the Doctor from its grip and to ensure the safety of the passengers . Despite this , the Doctor had no idea if this killed the entity or if it survived . In light of the incident , the Leisure Palace Company decided to withdraw its facilities from Midnight and abandon the planet to its eternal silence once more , preventing the entity , if it survived or if there were more , from claiming any more victims . ( TV : " Midnight " ) Powers and abilities . The Midnight entity was capable of surviving on the planet Midnight , despite the fact that the X - tonic ray s should have killed any being on the surface . It was capable of shaking a Crusader 50 bus , causing dents in its walls and ripping off the cockpit , feats which would require great strength . Though the X - tonic radiation was lethal to all known lifeforms , the creature was able to live on the surface for millions of years yet it also was able to cause significant damage to a shuttle bus and knock on its hull , something which would have required some sort of tangible presence . The Midnight entity could also possess a human . It would start to copy what the people around it said , then speak at the same time and then predict what people would say . The Doctor believed it was trying to learn about its surroundings . The being seemed to be able to learn at an incredibly rapid pace and absorbed the passengers ' speech without forgetting , hesitating , or making a single mistake . As the inhabitants of the ship turned on the Doctor , the entity singled him out as a target . It then paralysed him and forced him to copy the entity ' s speech , " stealing his voice " . It also mimicked his mannerisms , such as his use of Italian and French phrases , ( " molto bene " and " allons - y " ) . ( TV : " Midnight " ) It was described by Jack Harkness as a creature that could eat its way into the brain and steal the host ' s voice . ( WC : " " )