Gillan's early television acting career included guest appearances on several drama series, with her first role being in an episode of Rebus, a role she obtained while still at Italia Conti.
Awal karier akting televisi Gillan termasuk penampilan tamu di beberapa serial drama, dengan peran pertamanya berada di sebuah episode dari Rebus, peran yang dia peroleh saat masih di Italia Conti.