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The following is a list of characters who first appear in the fourth series of the BBC school drama Waterloo Road , in order of first appearance .. Waterloo Road. Waterloo Road ( TV series ). The fourth series consists of twenty episodes , first broadcast from 17 January to 20 May 2009 .. The main cast remains mostly unchanged from series 3 , augmented by Rob Cleaver in the first ten episodes and returning character Kim Campbell from episode eleven .. Rob Cleaver. #Rob Cleaver. Kim Campbell. List of Waterloo Road characters ( series 1 )#Kim Campbell. The Kelly family , consisting of mother Rose and her children Marley , Earl , Sambuca and Denzil , all first appear in episode 1 .. Rose. #Rose Kelly. Marley. #Marley Kelly. Earl. #Earl Kelly. Sambuca. #Sambuca Kelly. Denzil. #Denzil Kely. Head Girl Flick Mellor and her father Ralph , head of the board of governors and local police chief , also debut in episode 1 , as does head of extended services , and sister to head teacher Rachel Mason , Melissa Ryan .. Flick Mellor. #Flick Mellor. Ralph. #Ralph Mellor. Rachel Mason. #List of Waterloo Road characters ( series 3 )#Rachel Mason. Melissa Ryan. #Melissa Ryan. Melissa 's son Phillip and security guard Dave Miller first appear in episode two , and pupil Lauren Fletcher -LRB- later Lauren Andrews -RRB- makes her first appearance in episode six .. Phillip. #Phillip Ryan. Dave Miller. #Dave Miller. Lauren Fletcher. #Lauren Andrews