Exo/Space Time continuum. Pocket universe located outside normal space (N-Space). The TARDIS became trapped in E-Space after going through a Charged Vacuum Emboitement. While in E-Space, the Fourth Doctor and Romana stopped on Alzarius (5R), then defeated the Great Vampire, who had escaped to E-Space after fleeing from the Time Lords (5P). Romana helped free the Tharils from Rorvik and elected to stay in E-Space with K9 (Mark II) (5S). The Doctor later found that the Logopolitans used E-Space to save the Universe from heat death (5V).