'Glee': Season four promo unveils four new stars - video
The clip provides a first look at Rachel's new love interest Brody Weston, played by Terra Nova actor Dean Geyer.
"He's the only guy that Finn has really had to compete with for Rachel," Lea Michele explains.
The promo also introduces Glee fans to Puck's half-brother Jake (Jacob Artist), who is said to have "an attitude problem" that could hinder his chances of joining the Glee club.
Melissa Benoist (Homeland) also joins the Fox musical drama as new student Marley Rose, while Becca Tobin will debut as cheerleader Kitty, a "ruthless" new rival for Brittany (Heather Morris).
In addition, the 3-minute trail provides a first look at Kate Hudson's guest turn as Rachel's new dance teacher, the "mean and petty" Cassandra July.
Season four of Glee premieres at 9pm on Thursday, September 13 on Fox in the US. The show airs on Sky1 in the UK.