of the episode, Maren has for months been attempting to rekindle the flame with powdered rineweed. By the time of the 2013 mini-episode "The Night of the Doctor", the Sisterhood has "elevated" "Time Lord science" so that not only can their elixir trigger regeneration, but different potions can be prepared which can cause specific changes in the Time Lord's new body. The Eighth Doctor uses this upgraded elixir to save himself and consciously opts to become "a warrior", regenerating into the War Doctor. However, in his novelisation of the story, Steven Moffat explains the sisters gave the Doctor lemonade, lying about the elixir to convince him to regenerate into a warrior. The Sisterhood is able to prevent Colony Sarff, an agent of Davros, from separating into his individual components and attacking them ("The Magician's Apprentice"). Whether this is due to the atmosphere of Karn or their own mental powers is unrevealed. TV appearances In the serial The Brain of Morbius, the Fourth Doctor (Tom Baker) is accused of being sent by the Time Lords to steal the Elixir. The Doctor denies this, saying that the last thing he remembers is having wine with Solon and Morbius, but Morbius is dead, executed by the Time Lords on Karn for leading a rebellion. His body was placed in a dispersal chamber and atomised. The Doctor realises that just before he passed out, he felt the mind of Morbius. The Sisters refuse to believe that Morbius is alive and says that the Doctor will join him in death shortly. The Sisters gather wood to burn the Doctor at the stake. The Doctor points out that the Time Lords have always been friendly to the Sisterhood — they saved them when Morbius overran the planet. The Sisters are unconvinced, and they tie the Doctor to the stake while chanting the Song of Death. At the last moment, the Doctor is rescued by his companion Sarah Jane Smith (Elisabeth Sladen), and makes his way to safety. After the Doctor re-kindles the Sacred Flame and deals with Morbius, he is reconciled with the Sisterhood, and they part amicably. In the mini-episode "The Night of the Doctor", the mortally-injured Eighth Doctor (Paul McGann) is taken in by the Sisterhood of Karn, who revive him temporarily. The Sisterhood's leader, Ohila (Clare Higgins), offers the Doctor a selection of potions which, if consumed before he expires, will not only