Guest Stars Alexander Armstrong as Mr Smith Tommy Knight as Luke Smith Yasmin Paige as Maria Jackson Joseph Millson as Alan Jackson John Leeson voices K-9 Juliet Cowan as Chrissie Jackson Samantha Bond as Mrs Wormwood Jamie Davis as Davey Sydney Rae White as Bubbleshock girl Gethin Jones as Himself Konnie Huq as Herself Porsha Lawrence-Mavour as Kelsey Rungano Nyoni as Secretary Philip North as Technician Olivia Hill as TV Reporter