Undertale: A Musical Retelling

Undertale: A Musical Retelling is a Musical-Theatrical Production with Songs by Toby Fox. It was known for being the first musical who went to the internet for lyrical ideas.

The musical began production on September 15, 2018. Which, coincidentally was also the third anniversary of the game. Like the game, it received nationwide critical acclaim. The musical was successful with many awards such as the Tony Award for Best Musical and the Laurence Oliver Award Best New Musical.

Prologue
The story begins as we hear figures sing "Once upon a time". The song tells of a great war between two races known as Monsters (anthropomorphic animals, and creatures from mythology). And humans. The humans won and used magic to seal the monsters in a faraway cavern. It's at this point that the singers are revealed as the monsters. However, there's hop for them as a mysterious human child falls down, and gives the monsters hope of being able to be saved.

Act I
We begin the story from a bed of flowers the human lands in. As they navigate for help, they encounter a friendly-looking sentient flower. They refer to themself as "Flowey the Flower".