Britney Spears Is 'Magical' On 'Glee,' Stars Say

'It's going to be Spearstacular,' says Heather Morris.

Britney Spears' long-anticipated "Glee" episode debuts on Tuesday night (September 28). And the cast of the Fox hit promises that the show will live up to its high expectations.

"People that love this show or even like this show, they're going to love this episode," John Stamos teased in an

target="_blank">interview posted online. "I don't feel like Britney stole my thunder ... maybe a little. Well, it's her show. [The episode is] called 'Britney/Brittany.' "

Stamos plays a key role in the episode. His character, Dr. Carl Howell, gives Brittany (Heather Morris) and Santana (Naya Rivera) the anesthesia that prompts their trippy ride through the singer's hit-filled catalog. Morris noted that Britney and Brittany will also throw down on the dance floor: "They're going to dance together," she said of her character and the pop star.

"When I was younger she was, like, my idol," Morris continued. " '[I'm a] Slave [4 U]' is, like, the best video ever. I am, like, literally an inch away from Britney Spears, who I used to watch on television and, like, learn dance moves to. ... It's going to be Spearstacular."

Like Morris, Rivera has warm memories of growing up a Spears fan. "I love Britney Spears. I mean, who doesn't? We all grew up with her," she said. "The first music purchase I ever made was ' ... Baby One More Time' on cassette. [It was like], Britney Spears is going to be in my mitts, what do I do? [And I was like], 'Hi Britney!' And then she was like, 'Hey!' She was awesome and beautiful. She was, like, magical."

Corey Monteith teased that his performance will be worth watching. "I am very excited about performing the 'Toxic' number. It's going to be very cool," he dished. "It's going to be an interpretation of the song you would not see coming."

The cast will also cover Spears classics like "Stronger" and "Me Against the Music."

Which song are you most looking forward to on the Britney episode? Let us know in the comments!