The new season of Doctor Who will star Varada Sethu as the companion.Following the decision of Millie Gibson's Ruby Sunday to cease travelling with the Time Lord, Sethu will co-star with Ncuti Gatwa as Belinda Chandra.

Davies says that Belinda Chandra is unusually resistant to the Doctor's lifestyle: "Why am I a prisoner on this runaway train? Get me home!"

Yet that is exactly what happened to Varada Sethu when she was received a phonecall from showrunner Russell T. Davis, asking her to audition for Doctor Who. “I went in and it became obvious within a few minutes that they were offering me the job.