Not afraid to broach difficult topics, “Glee” has a new episode called “Shooting Star” that deals with the tragedy of mass murder in schools.

The latest installment kicks off with a sobering disclaimer- "This episode of Glee addresses the topic of school violence. Viewer discretion is advised."

After hearing shots fired, Will Schuester instructs the students to hide in a closet, declaring, "Start texting, tweeting, let everyone know what's going on but don't tell them we're here. Alright? Shooters have smart moves, too."

Following the airing of the show, Lea Michele tweeted, "Such a moving a powerful episode tonight . . . Made me so proud to be a part of this show."