Darren Criss made such an impression when he appeared on last week’s Glee that he's been asked to join the cast.

Criss will become a series regular, appearing throughout the rest of the second season before becoming a cast member in Season 3. Criss plays prep school student Blaine and Kurt’s (Chris Colfer’s) suspected love interest.

The “Teenage Dream” number performed by Criss as part of the Dalton Academy Warblers scored more than 55,000 downloads the first day it debuted on iTunes.