Guest Stars Jemma Redgrave as Kate Stewart Aidan Cook as Zygon Tom Wilton as Zygon Ingrid Oliver as Petronella Osgood Jenna Coleman as Bonnie Jaye Griffiths as Jac Rebecca Front as Walsh Gretchen Egolf as Norlander Abhishek Singh as Little Boy Jill Winternitz as Lisa Cleopatra Dickens as Claudette Sasha Dickens as Jemima Samila Kularatne as Little Boy's Mum Todd Kramer as John Hitchley Karen Mann as Hitchley's Mom