Nyssa 's fate after she leaves the TARDIS is not known , although the spin-off novel Asylum , by Peter Darvill-Evans , depict that Nyssa eventually leaves Terminus and settles down as an academic in a university on an unspecified planet .
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 .