Nancy and Bree's ballet class is putting on a Mermaid Ballet, but when they audition, Grace gets the role of the mermaid, and Nancy is to play the seaweed and Bree a clam. Soon, when Grace sprains her ankle, she takes over Bree's role as the clam, leaving Bree to play the mermaid much to Nancy's jealousy.
to be added
In order of appearance:
- Rhonda and Wanda
- Madame Lucille
- Doug Clancy (dad)
- Claire Clancy (mom)
- Mr. Monkey
- Nancy's Imagination
- Madame Lucille's Dance Academy
- Clancys' House (backyard, frontyard and Nancy's room)
- Jameses' House (Bree's room)
- Mia Sinclair Jenness as Nancy Clancy
- Dana Heath as Bree James
- Hannah Nordberg as Grace
- Malachi Barton as Lionel
- Ruby Jay as Rhonda and Wanda
- Ian Chen as Jonathan
- Rachael Macfarlane as Madame Lucille
- Rob Riggle as Doug Clancy (Dad)
- Alyson Hannigan as Claire Clancy (Mom)
- It is the second episode whose name is the same as an original Fancy Nancy book.
- The first one was "Bonjour Butterfly", and as the first time, this is not based on its original-series book version.
- An all-new book version of this segment is set to release on June 2, 2020.
- This is the fourth appearance of Madame Lucille, the second as Nancy and Bree's dance teacher.
- It's unknown what happened with the girls who appeared in "La Danse of Friendship", and how all the Oak Street kids ended taking dance classes.
- This episode features the third song about Nancy and Bree's friendship.
- Mermaid version of Nancy appears when she is daydreaming.
- Even though there are not new outfits for Nancy and Bree, there is for all the other Oak Street kids, including Jonathan.
- This episode was originally scheduled to air on January 31, 2020 before being rescheduled to February 28.
- "JANUARY 2020 PROGRAMMING HIGHLIGHTS FOR DISNEY CHANNEL, DISNEY XD AND DISNEY JUNIOR." Walt Disney Television Press. Retrieved on December 12, 2019.
- "Disney Junior Fancy Nancy: Nancy and the Mermaid Ballet". Harper Collins Publishers. Retrieved February 28, 2020.