Kristen Bell and Jonathan Groff are gearing up to reunite for a brand new original musical.

According to Deadline, Frozen II vets Kristen Bell and Jonathan Groff have officially signed on to star in Molly and the Moon.

Described as an original movie musical, Molly and the Moon hails from How I Met Your Mother vets Carter Bays and Craig Thomas. Bays and Thomas wrote the script for the project and will in turn, also serve as directors.

Others involved behind the scenes on the project are Nathan Larson, who will compose, The Get Down’s Stephanie Diaz-Matos who will serve as music supervisor, and Pitch Perfect alum Harvey Mason Jr., who will act as executive music producer.

For the movie musical, Kristen Bell and Jonathan Groff are set to play a couple who are expecting and sing to their unborn child. Fro there, viewers will venture into the womb where the couple’s unborn baby girl reaches for “the moon” through the help of her parents voices.

The concept for Molly and the Moon was inspired Thomas and his wife’s own experience becoming first time parents to their son Elliot, who was born with Jacobsen Syndrome and subsequently had to have open heart surgery at 2 weeks old.

“He was having a more mythic, epic journey that I had in my three decades of life, all in his first couple of weeks of life,” Thomas told Deadline. “Carter found himself wondering too, what is that little life going through in this plastic box? What is Elliot thinking and feeling as he’s lying there? You hear phrases like, ‘Oh the surgery went well but he’s not out of the woods yet,’ and we would wonder, what are the woods like, and how would you show them? Later, that would inspire elements of Molly and the Moon.”

Currently, there’s no word on when we can expect Molly and the Moon starring Kristen Bell and Jonathan Groff to debut.