After he reveals to Finn that he is actually the Grand Master of the Gnomes and the ruler of the Beneathaverse, the underground world that the gnomes live in, he says that he had been looking for someone with endless power for his machine, the Upturnoverdrive, which will turn the world upside down so that gnomes would rule the world. The gnomes use Finn to power the Cyclonic Roticerod, the Plasma Ball, and the Brain Machine (components of the Upturnoverdrive). They shock him whenever he becomes tired.
They are powering their last machine when suddenly Jake jumps down and begins smashing all the machines and freeing Finn. The gnome leader attempts to blast Jake with a laser while he had the power bestowed upon him by the Party God. Jake punches the laser and destroys it, defeating the gnome ruler.
- The Gnome Ruler was voiced by Paul Reubens, famously known for his role as Pee-Wee Herman.
|Adventure Time Villains|
Ice King | Marceline Abadeer | Lumpy Space Princess | Orgalorg | The Lich | Hunson Abadeer | Earl of Lemongrab | Flame Princess | Martin Mertens | Ricardio | Death | Marshall Lee | Ice Queen | Patience St Pim | Dr. Gross | Shoko | Magic Man | Vampire King | The Fool | The Empress | The Hierophant | The Moon | Ash | Flame King | Fire Count | Don Jon | Fire Kingdom | The Guardian | Gareth | Flying Lettuce Brothers | Tiffany Oiler | Guardians of Sunshine | Ooze Monsters | Fear Feaster | Kee-Oth | Maja the Sky Witch | Darren the Ancient Sleeper | Goliad | Blargetha | Demon Cat | Guardian Angel | Wendy, Booboo & Georgy | Squirrel | Stag | Scorcher | Jaybird | Smudge | Princess Cookie | Tree Witch | Xergiok | Me-Mow | Alpha Hug Wolf | Tree of Blight | Evil Monster | Donny | The Glitch | Grassy Wizard | Fight King | Furnace | Torcho | Gnome Ruler | Sir Slicer | King Worm | Blanket Dragon | Little Dude | Cute King | Why-Wolves | The Hooligans Who Love Candles