<P> The Young Offenders is an Irish television sitcom, developed by Peter Foott, for RTÉ Two and BBC Three . Based on the IFTA - winning film of the same name, it follows the lives of Cork teenagers Conor MacSweeney (Alex Murphy) and Jock O'Keeffe (Chris Walley), which includes their young criminal activity, their feud with their principal, Barry Walsh (P.J. Gallagher) and their relationships with their principal's daughters . </P> <P> The series follows the adventurous life of Cork teenagers Conor MacSweeney (Alex Murphy) and Jock O'Keeffe (Chris Walley). Their criminal activities often brings themselves into trouble with the police, and their positions at their school is repeatedly put in jeopardy . Their continuous feud with their principal, Barry Walsh (P.J. Gallagher), is well - depicted throughout the series' narrative, and their feelings for Principal Walsh's daughters Siobhan and Linda is also shown through the show . </P> <Ul> <Li> Alex Murphy as Conor MacSweeney </Li> <Li> Chris Walley as Jock O'Keeffe </Li> <Li> Hilary Rose as Mairead MacSweeney </Li> <Li> Dominic MacHale as Sergeant Healy </Li> <Li> P.J. Gallagher as Principal Barry Walsh </Li> <Li> Jennifer Barry as Siobhan Walsh </Li> <Li> Demi Isaac Oviawe as Linda Walsh </Li> <Li> Shane Casey as Billy Murphy </Li> <Li> Chris Kent as Conor's Dad </Li> <Li> Orla Fitzgerald as Orla Walsh </Li> <Li> Cora Fenton as Jock's Mum </Li> <Li> Michael Sands as Jock's Dad </Li> </Ul> <Li> Alex Murphy as Conor MacSweeney </Li>

Who plays billy murphy in the young offenders