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. Gillan then undertook a two-year stint as a member of the ensemble cast of the sketch comedy series The Kevin Bishop Show, in which she played multiple characters including celebrities such as Katy Perry and Angelina Jolie. Gillan also appeared on TV in a leading role in a horror project entitled The Well, which was broadcast as a series of episodic short films on BBC Two and later as a web series on BBC. co. uk. Part of the BBC's multimedia "switch" programming, the short episodes interconnect with online games that further explore the environments presented in the series. She has appeared in the Channel 4 film Stacked (2008).