Waterloo Road welcomes Viv O'Donnell, local radio DJ superstar, who has arrived to host her live radio show at the school. Everyone's excited about having a masterclass in radio journalism from a chat show supremo; everyone, that is, except her daughter Andi, a loner in Scout and Emily's class, who shies away from her mum's limelight. Sian and Michael wake up late, having spent the night together in a hotel. Jez, meanwhile, is trying to move past his suspicions but he steals Sian's car keys to check her GPS, only to discover that she has lied about her whereabouts and had really been at a hotel. He confronts Sian, who breaks down with guilt and confesses to the affair. Trudi gets a raw deal from Finn when it accidentally comes out that her dad has marriage plans for her with a family friend. And Tariq comes to Chalky's aid when he burns his surprise dinner for Linda.