A birthday party is thrown for Casey. Casey has a drink and ends up upsetting Alison and the whole party ends in chaos. Reg dies from a drug overdose at the party. Luke thinks that Elwood sold Reg the drugs. Matt continues to try and get Casey and Alison back together. Alison is shocked when she sees Casey and Jade together sharing an intimate moment. Henry catches Vienna putting a hole in a condom as Katie continues to deceive Brad.