Corbin Bleu Makes Surprise Appearance at 'High School Musical 4' Open Casting Call!

Corbin Bleu takes the mic while surprising the crowd at a High School Musical 4 opening call audition on Sunday (May 15) at the Anaheim Convention Center in Anaheim, Calif.

The 27-year-old actor, who starred in the original DCOM series, encouraged the 5,000 young actors, singers, and dancers who traveled from all across the country to try out.

PHOTOS: Check out the latest pics of Corbin Bleu

The latest casting rumor has actress Merit Leighton being considered for the female lead.

In case you missed them, check out the descriptions for all the new characters!