The wait is finally over for all the Gleeks out there as Jessica Sanchez makes her much anticipated debut during the show's fourth season finale on Thursday.

A fresh behind-the-scene teaser has just been released by producers showing Sanchez gamely pitting talents against mainstays of the show. She plays Frida Romero, lead vocalist of Hoosierdaddies, New Directions' potent rival at the Regionals.

"It's crazy but it's so much fun!" Sanchez says of the experience which comes simultaneously with a busy singing career promoting her debut album "Me, You and the Music."

Sanchez's role Romero will take the Glee center stage singing the songs "Clarity" by Zedd and "Wings" by Little Mix.

Watch the preview and see how Sanchez mixes in with the entire cast.

Sanchez is just one of several stars that appear in the hit Fox musical's fourth season. Patty Duke and Meredith Baxter are also expected to grace the show for the first time this week.