Nyssa's fate after she leaves the TARDIS is not known, although the spin-off novel "Asylum", by Peter Darvill-Evans, reveals that she eventually leaves Terminus and settles down as an academic in a university on an unspecified planet. In "Asylum", Nyssa shares an adventure with the Fourth Doctor from a time before he met her, leaving the Doctor with the knowledge that he will have to be extremely careful dealing with Nyssa when they eventually meet to avoid changing history.