'Wicked' On Broadway Turns 15 With Halloween Concert (PHOTOS)

The hit musical 'Wicked' started its Broadway run 15 years ago on October 30, 2003. With Idina Menzel and Kristin Chenoweth leading the original cast, 'Wicked' earned not only critical acclaim, but astounding box office success not seen since Disney's 'The Lion King' roared onto the stage in 1997. To date, "Wicked" has reportedly earned over 1 billion from Broadway ticket sales, not including the show's national tour or multiple international productions.

To honor the milestone anniversary, NBC hosted 'A Very Wicked Halloween,' showcasing the Tony Award-winning show's iconic music with original, past and present stars of the cast. Ariana Grande, Adam Lambert, Pentatonix and more were also invited to get on stage and belt out some of the memorable tunes.

From Idina Menzel's "Defying Gravity" to Kristin Chenoweth's "Popular," see all the best moments from the special concert below!

Kristin Chenoweth and Idina Menzel, stars of the original cast, reunite onstage at 'A Very Wicked Halloween: Celebrating 15 Years on Broadway' special concert. (Eric Liebowitz/NBC)

Kristin Chenoweth and Idina Menzel reunite onstage at 'A Very Wicked Halloween: Celebrating 15 Years on Broadway' special concert. (Eric Liebowitz/NBC)

Kristin Chenoweth and fans onstage during NBC's 'A Very Wicked Halloween.' (Eric Liebowitz/NBC)

Ariana Grande performs "The Wizard And I" onstage at NBC's 'A Very Wicked Halloween' celebration. (Eric Liebowitz/NBC)

Musical group Pentatonix performs "What Is This Feeling" onstage during NBC's 'A Very Wicked Halloween' celebration. (Eric Liebowitz/NBC)

Idina Menzel, who won the best actress Tony Award for her portrayal of Elphaba, belted out the show's powerhouse number "Defying Gravity" to an emotional crowd. (Eric Liebowitz/NBC)

Adam Lambert and Ledisi sing the show's love duet "As Long As You're Mine." (Eric Liebowitz/NBC)

Kristin Chenoweth sings the fan-favorite "Popular" to a gleeful crowd. (Eric Liebowitz/NBC)

Kristin Chenoweth and Idina Menzel onstage during 'A Very Wicked Halloween" concert. (Eric Liebowitz/NBC)

Kristin Chenoweth onstage during 'A Very Wicked Halloween" concert. (Eric Liebowitz/NBC)

Kristin Chenoweth and Idina Menze close the special concert with the emotional friendship duet "For Good." (Eric Liebowitz/NBC)

Every actress who has played Elphaba and Glinda over the course of the show's 15 years on Broadway, joined Menzel and Chenoweth during the finale. (Eric Liebowitz/NBC)

Stephen Schwartz, the show's composer and lyricist, joined the leading ladies stage for curtain call. (Eric Liebowitz/NBC)

Lead photos by Eric Liebowitz/NBC