“Wicked” fans can see Kristin Chenoweth and Idina Menzel reunite on Monday, and they don’t even have to pay Broadway ticket prices. The two are performing together on “A Very Wicked Halloween,” the TV special celebrating the musical’s 15th anniversary.

The special is a concert where Menzel and Chenoweth, the original Elphaba and Glinda, respectively, will serve as hosts and performers. They’ll be joined by a few familiar faces too. “Wicked” diehards will want to make sure they tune in to see the event.

“A Very Wicked Halloween: Celebrating 15 Years on Broadway” airs Monday, Oct. 29 at 10 p.m. EDT. The hour-long special premieres on NBC. Those who aren’t near a TV can live stream the even from NBC’s website after they sign in with information from their cable provider.

Wicked TV special
Kristin Chenoweth (left) and Idina Menzel will perform some of their hit songs from "Wicked" on a Monday night TV special. Eric Liebowitz/NBC

The event is bringing plenty of star power. In addition to Menzel and Chenoweth, who will belt out favorites like “Defying Gravity” and “Popular,” several other former “Wicked” actresses will hit the stage as well as current leading ladies, Jessica Vosk and Amanda Jane Cooper. Even composer Stephen Schwartz will have a moment with the leading ladies.

Ariana Grande is also set to perform. The “God is a Woman” singer will belt out “The Wizard and I.” Though her highly publicized breakup with Pete Davidson stirred rumors that Grande would cancel, the 25-year-old took to social media earlier this month to say she was “honored to be included in this celebration of 15 years of my favorite musical of all time” and “wouldn’t miss it for the whole universe.”

Wicked Ariana Grande
"Wicked" fan Ariana Grande will honor the show on "A Very Wicked Halloween: Celebrating 15 Years on Broadway." Eric Liebowitz/NBC

Adam Lambert will join the Halloween special as well. The “American Idol” alum actually got his start as a Fiyero understudy in the national touring company of “Wicked.” The “Rocky Horror” actor is singing alongside Ledisi, a Grammy-nominated R&B singer. Fans will have to tune in to find out what they’ll sing.

Pentatonix may have just released their Christmas album, “Christmas Is Here,” but they’ll get in the Halloween spirit with their “Wicked” tribute.

Wicked special
Ledisi and Adam Lambert sing a duet on "A Very Wicked Halloween." Virginia Sherwood/NBC

“A Very Wicked Halloween” was taped Oct. 16 at the Marquis Theatre in New York City. That’s just two weeks before the musical’s actual Broadway anniversary on Tuesday, Oct. 30. The show opened in 2003 and was an instant hit among theatergoers. Over 11 million Broadway audience members have seen “Wicked,” a musical about what happened to the Wicked Witch of the West and the Good Witch of the South before Dorothy Gail arrived in Oz. The show is still playing at the Gershwin Theatre.

“Wicked” is really going all out to celebrate the 15th anniversary of the Broadway premiere. In addition to the TV special, there is a whole new line of “Wicked” merchandise at the NBC store, and there are special limited-edition treats at Baked by Melissa, Ben & Jerry’s and Schmackary’s in New York. Inglot launched a new makeup palette inspired by the musical on Monday, and the Empire State Building will be emerald green on Tuesday.

Wicked reunion
Kristin Chenoweth (left) and Idina Menzel reunited to celebrate the 15th anniversary of "Wicked" on Broadway. Virginia Sherwood/NBC