Sub-dimensional void
From Tardis Wiki, the free Doctor Who reference
The Corsair kept a sub-dimensional void in a hatbox in 23rd century Swindon. The Ninth Doctor was also brought to such a void by Arnora, Mother Superior of the Unon, to interrogate his mind. Captain Jack Harkness was later taken to the void to have his future read by Grand High Seer Evja. (COMIC: Weapons of Past Destruction)
