However, he made it clear that if things had gone differently during his escape, he would have taken the Type 50. ( AUDIO : Prisoners of Fate ) By one account of the theft, Susan was one of Rassilon 's descendants, Lady Larn, and had hidden herself aboard the TARDIS, electing to join the Doctor when he stole the craft. ( PROSE : Birth of a Renegade ) In another, the Doctor's only company when he boarded the TARDIS was the Hand of Omega which overrode the safeguards that forbade the ship from travelling...