Duchess Swan enlists the help of Ashlynn Ella and Hunter Huntsman to save her beloved Enchanted Lake from pollution.
Duchess is having a pleasant dance session by her lakeside, but out of the blue, green ooze starts leaking and she tumbles into the Lake. After discovering that a nearby restaurant is the cause of this, an enraged Duchess decides to confront the guilty culprit.
The dumper of the slime is no other than the Marsh King, but he isn't the type to negotiate with, nor a good listener. With nowhere to turn to, Duchess enlists the help of other students. Raven keeps her distance from Duchess after an animal incident in Beast Training and Care, whilst Dexter now has double-vision. After the two slam both doors on her, she turns to Ashlynn Ella and Hunter Huntsman, two environmentalists.
Ashlynn and Hunter help Duchess sneak into the restaurant, finding a terrible sight inside the kitchen. Ashlynn records around the area, soon sending the video to Book End officials, who arrest the Marsh King and shut down his establishment afterwards. News Reporters interview Duchess, who claims she was the only one to save the Lake. After watching the newscast, Ashlynn and Hunter snap about Duchess's boasting.