TARDIS holding ring

The TARDIS holding ring was a section of the Doctor's TARDIS where the Doctor stored the accommodations of his companions after they had stopped travelling with him. It included the rooms of Susan Campbell, Ian, Barbara, Vicki, Steven, Dodo, Polly, Ben, Jamie, Victoria and on, and the final room was for Tamsin. When Lucie Miller and Susan explored the holding cell, they found that the first and last rooms were next to each other. Before the space for Susan, there was a room expecting for her son Alex Campbell. After an accident with a Blitzen fish, the Eighth Doctor deleted all the rooms but one. (AUDIO: Relative Dimensions)