The Gang make preparations for the upcoming 5-class Siasconet High reunion,but the events of the reunion are not what anyone expects.

After receiving the news that he might be the father of Sara's little boy,Jason,Joe is advised by Roy to keep quite on the whole affair,but Joe's guilt forces him to tell Joe and Helen.Brian is angry that Joe slept with his ex-girlfriend;Helen is upset but supportive.When blood tests reveal that Joeis not the father,Joe and Helen are happy.But it dashes Brian's hopes of Sara staying on the island as she decides to leave to find the Jason's true father.

Meanwhile,Lowell questions his choice in careers and Antonio struggles to make Casey his valentine.