With its group dance numbers and earnest covers of songs like Journey’s buoyant “Don’t Stop Believin’,” Glee seems like the sunniest show on TV. But darkness lurks just barely below the surface — the series also seamlessly weaves in plots about teen pregnancy, scheming wives and the most hard-hearted cheerleading coach to ever grip a whistle. Rolling Stone ventures into the Fox hit’s most controversial corners, uncovering the stories behind stolen car stereos, illegal substances, Facebook-revenge fantasies and more in the new issue.

Glee creator Ryan Murphy, who previously helmed Nip/Tuck, explains the show’s double-edged appeal: “It’s about there being great joy to being different, and great pain.” Twenty-three-year-old Lea Michele, the Broadway talent who plays Rachel, tells RS about her tattoos, and Cory Monteith, who portrays jock Finn, owns up to a few childhood arrests for offenses that “didn’t hurt people.” Dianna Argon (slippery cheerleader Quinn) describes what it was like joining the cast late and falling victim to Monteith’s fart pranks, and 19-year-old Chris Colfer, who bravely plays gay teen Kurt, opens up about his own painful youth and his never-changing voice. “You know that forget-and-forgive bullshit? No, no, no, no, not for me,” he says of channeling childhood traumas into creative energy. “You take that grudge and let that grudge fester, and then you use it.”

The only Glee cast member who talks back is Jane Lynch, but her softer side comes out when she stopped by the Rolling Stone offices recently for an Off the Cuff chat with Rolling Stone movie critic Peter Travers. For the full interview with Lynch, go to RollingStone.com.