In The ClueFinders 6th Grade Adventures: The Empire of the Plant People while playing a game of frisbee, Joni accidentally tosses the disc over the fence into the overgrown yard of their friendly neighbor Miss Rose. When Joni and Santiago enter Miss Rose's yard to find the frisbee, the ground opens up and swallows them. Owen, Leslie and LapTrap investigate to look for their lost team members and find a labyrinth under the yard inhabited by self-aware, anthropomorphic talking plants. They learn from a friendly plant named Ficus that the plants have captured Joni and Santiago and are concocting a plan to attack the town above.