activation of the Time Engine. In the 2005 series, the Ninth Doctor claims that he can sense the movement of the Earth through space as well as being able to perceive the past and all possible futures. He is also able to concentrate and time his motions well enough to step safely through the blades of a rapidly spinning fan, and later claims that if any Time Lords still existed, he would be able to sense them. As the Tenth Doctor he repeats this assertion, adding also that he is somehow innately able to sense which events in time are 'fixed' and which are in 'flux'. The Eleventh Doctor slightly amends what was said earlier in "The Doctor's Wife", saying that he could only sense if there were other Time Lords in this universe. In the original series episode Warriors' Gate, Romana is called a 'time-sensitive' by a marauding slaver and, though she seems to deny this, is able to interface with his spaceship in ways that only a 'time-sensitive' is supposed to be able to. In "Utopia", the Tenth Doctor states that he finds it difficult to look at Captain Jack Harkness because Jack's existence has become fixed in time and space. In the Series 4 episode "Journey's End", the Tenth Doctor was shown to use his telepathic abilities to wipe Donna Noble's mind of certain memories, specifically the memories of her travels in the TARDIS and to 'implant' a defence mechanism which is activated in "The End of Time". The War Games showed that other Time Lords are also able to erase people's memories, as in that story, Jamie and Zoe's travels with the Doctor were erased from their memory, and the council of Time Lords also put a memory block on the Doctor so he could not pilot the TARDIS. In the Series 5 episode "The Big Bang" the Doctor telepathically left a message in Amy Pond's head before sealing her into the Pandorica so that she would know what was happening when she woke up. Time Lords, or at least the Doctor, can read extremely quickly. Regeneration Time Lords also have the ability to regenerate their bodies when their current body is mortally wounded. This process results in their body undergoing a transformation, gaining a new physical form and a new personality; a Time Lord who was pleasant and polite in his previous regeneration might express