Guest Stars Daniel Anthony as Clyde Langer Alexander Armstrong as Mr Smith Tommy Knight as Luke Smith Yasmin Paige as Maria Jackson Joseph Millson as Alan Jackson Juliet Cowan as Chrissie Jackson Floella Benjamin as Professor Rivers Jay Simpson as Jay Paul Kasey as Jay Slitheen Jimmy Vee as Nathan Slitheen Ruari Mears as Heidi Slitheen Holly Atkins as Heidi Ryan Watson as Nathan Goss Julian Dutton as Chief Inspector Uncredited Samantha E. Hunt as Agatha