- You may be looking for Battle TARDIS.
They could map their interior dimensions onto the outer dimensions, making for an imposing sight. They could not withstand many shots of weapons fire from the first Type-102 TARDIS known as Compassion. (PROSE: The Ancestor Cell)
Older versions, built during the Dark Times when the Time Lords fought the Great Vampires, were the size of comets and had unstable real world interfaces. One was damaged in the War and became known as the astronomical body Cassandra. (PROSE: So Vile a Sin)