Guest Stars Sacha Dhawan as The Master Bhavnisha Parmar as Sonya Khan Shobna Gulati as Najia Khan Ravin J. Ganatra as Hakim Khan Lenny Henry as Daniel Barton Sylvie Briggs as Ada Lovelace Mark Dexter as Charles Babbage Tom Ashley as Airport Worker Aurora Marion as Noor Inayat Khan Kenneth Jay as Perkins Andrew Piper as Inventor Blanche Williams as Barton's Mother