Guest Stars Layton Williams as Stephen Carmichael Charlie Wernham as Mitchell Harper Nikki Runeckles as Chantelle Parsons Kae Alexander as Jing Chow Ethan Lawrence as Joe Poulter Jack Binstead as Rem Dogg Jack Bence as Frank Grayson Harry Enfield as Martin Wickes Samantha Spiro as Professor Celia Green Sam Douglas as Mitchell's Dad