Charice, the newest addition to hit TV series "Glee," sings Lady Gaga's "Telephone." (Photo grabbed from Glee's promo video)

MANILA, Philippines - A peek into Filipino international singing sensation Charice's performance in the popular American television series "Glee" is now possible through a promotional video.

A snippet of the one-and-a-half minute footage shows the 18-year-old Filipino singer and lead star Lea Michele (who portrays Rachel Berry) belting out Lady Gaga’s “Telephone” inside a bathroom in an apparent showdown.

Sue Sylvester (Jane Lynch) stops the brewing catfight.

In “Glee’s” second season, Charice portrays Sunshine Corazon, a Filipino exchange student at fictional William McKinley High School “whose killer vocals get Rachel contemplating murder.”

“Bones” stars Emily Deschanel and Tamara Taylor introduced the new season in the video.

The latest season of “Glee” will premiere on September 21, with its first episode titled “Auditions.”

Charice first made her name on local TV talent show "Little Big Star", where her performances became an Internet sensation and caught the interest of the US TV shows.

She has since appeared on the Ellen DeGeneres Show and several times on the Oprah Winfrey Show.

"You are a force to be reckoned with. That voice comes from something bigger than yourself," Winfrey raved after one performance.

Her debut, self-titled album had ranked No. 8 on the US Billboard charts.

"Glee" is an hour-long comedy series that follows an optimistic high school teacher as he tries to reignite his passion while working with a group of outcasts to revive the fortunes of the school's glee club.

Meanwhile, Charice will fly back to Manila on October 23 for the much anticipated concert at the Araneta Coliseum. She will perform alongside Natalie Cole and other international singers.

From Manila, they will proceed to Indonesia and Thailand. -With reports from Mario Dumaual, ABS-CBN News, and Agence France-Presse