The Fifth Doctor (in "Castrovalva") begins reverting to his previous personalities, and the Sixth Doctor experiences extreme paranoia, flying into a murderous rage and nearly killing his companion ("The Twin Dilemma", 1984). The Eighth Doctor experienced amnesia as a result of post-regeneration trauma (the 1996 television film); uniquely, the Doctor was "not alive" at the time of this regeneration. The regeneration from the Ninth to the Tenth Doctor sees the Doctor experiencing sudden spasms and great pain (""), and later being unconscious for most of the next fifteen hours ("The Christmas Invasion"). The regeneration from the Tenth to the Eleventh Doctor caused the Doctor to experience strange food cravings, only to be disgusted by them upon actually trying them ("The Eleventh Hour"). The Twelfth Doctor forgot how to fly the TARDIS (as well as the name of the TARDIS) right after the regeneration process in The Time of the Doctor. "The Brain of Morbius" implies that Time Lords other than the Doctor may experience difficult regenerations, since the Sisterhood of Karn had been supplying them with an "elixir of life" that could assist the process. In "The Night of the Doctor", the Sisterhood tell the Eighth Doctor they can provide elixirs to give rise to non-random regenerations, allowing the Doctor to specify either a physical type or personality. The Master showed a dramatic personality change upon regenerating into the Mistress/Missy. In that form, she wants nothing more than to renew her bond with the Doctor, even calling him her "boyfriend" at one point. ("Deep Breath, Death in Heaven") When she met him again, Missy pretended to be an android and kissed him passionately. ("Dark Water") Despite still being manic and a psychopath, she later showed a willingness to reform, spending centuries in the Doctor's custody as a show of her commitment. Later, she felt torn between the Doctor, who represented her repentance, and her past incarnation, who represented a return to her old ways; she ultimately chose the Doctor, for which her past incarnation killed her in disgust. In turn, though Missy expressed a love for who she was in her past incarnation, she forced his own regeneration into her to ensure she would become the person she now was ("The Doctor Falls"). The Doctor has always regenerated into a humanoid form. However, when explaining the process of regeneration to Rose at the end of "The Parting of the Ways", the Ninth Doctor suggests that his new form could have "two heads", or even "no head", and in the 2005 , which takes place immediately after that episode, the newly regenerated Tenth Doctor, while examining his new body, makes a point of checking that he has two arms, two legs and two hands, implying that regenerations can sometimes result in physically deformed or non-humanoid forms; similarly, the Eleventh Doctor, upon regenerating, shows relief to still have legs and proceeds to check whether he still has fingers and human facial features.