As Meg's (Brittany Snow) recently rekindled romance with Luke (guest star Jamie Elman) begins to heat up, she grows concerned over his level of ""experience"" in matters of love. Prompted by some sagely wisdom from Roxanne (Vanessa Lengies), she attempts to broaden her sex appeal with shocking results. Elsewhere, Jack (Tom Verica) decides to rethink Nathan's (guest star Keith Robinson) employment status after learning of Helen's (Gail O'Grady) brush with danger, and his involvement in her defense during the recent voter registration drive. Meanwhile, JJ (Will Estes) re-ignites his romance with Colleen (guest star Jessica Collins) as he prepares to celebrate his 18th birthday and Helen agonizes over her own secret from that fateful day with Professor Wit (guest star Robby Benson).

June 19, 1964: Jim Bunning's on the mound for the Phils and the Pryors have just begun their annual Wildwood vacation. Roxanne isn't with them because she's still mad at a still-distressed Meg. But her rich new friend Carol has invited her to her beach club at ""the Crest."" And Meg returns the favor, getting Carol and her friends into a Bandstand beach ""hop"" featuring the Kinks (Third Eye Blind does the impersonation). Meanwhile, Helen finally tells Jack about Professor Witt's advance. Back in town, JJ's at home---with Beth while Henry's minding the North Philly store. The neighborhood is steaming and the city pool hasn't opened yet.

As the anti-war movement gains momentum, Meg and Sam get caught in the crossfire at an anti-war rally and finds themselves taking a stand that may have severe consequences in their future. Jack also takes a stand on Beth and her marital status as he begins his campaign for city councilman. Helen makes a shocking discovery at work and Patty , disappointed with her first date, turns to Roxanne for advice. Meanwhile, JJ and his squad are surrounded by the Viet Cong and under heavy gunfire when they are told they will not be receiving backup and will be on their own