Zero Room

Overview
The Zero room is An important room in and part of the TARDIS.

The Zero Room was an atmospheric and calming room that are important to all, Timelords included. This became true for the fifth Incarnation of The Doctor. When The Doctor's regeneration failed, The Doctor used the Zero Room to help him become better.

The destruction of the Zero Room came when the TARDIS needed to eject part of its structure in order to boost itself out of danger. The part ejected was picked at ramdom choice and so its was an unwanted fact that it was ejected. However, it lived on from becoming a smaller capsule built by Nyssa. (DW: Castrovalva)