AceShowbiz -

The long rivalry between Rachel and Mercedes will become the highlight in the next episode of "Glee". The sneak peek for the episode teases that there will be an ultimate showdown between the two New Directions divas as Puck gushes, "This is clash of the titans."

However, there is a price to pay to reach stardom, and for Rachel it might be her friendship with the other glee kids. "Ten years from now, you'll be thinking 'bout the friends you had... and the ones that you just tossed aside," Kurt tells her.

While Rachel and Mercedes are up against each other, Mike Chang has his own battle as he is worrying about his grades. His parents step in to make sure he stays on track and his father will reportedly force him to drop out of the glee club, but Mike will get surprising support from an unexpected source.

Another character, Emma, also gets a visit from her parents, Rusty and Rose, which will provide a sneak peek into her deep rooted issues. Meanwhile, Brittany announces herself as the next senior class president.

"Asian F" will air next Tuesday, October 4 at 8/7c on FOX. Keong Sim and Tamlyn Tomita guest star as Mike's parents, while Don Most and Valerie Mahaffey will portray Rusty and Rose respectively.