A 9-year-old barbarian warrior from another world enters third grade and learns about the modern world, while trying to save his native land from a vile villain.

Following his father's death, 15-year-old Eli Shane embraces his destiny to follow in his dad's footsteps to a secret, subterranean world called Slugterra where he is determined to be the greatest Slugslinging hero of them all!

Denis has a best friend, a cat named Sir Meows A Lot. Unbeknownst to Denis, however, Sir Meows A Lot is a genius with questionable morals - not quite evil, but not exactly nice. However, Sir Meows A Lot has a nemesis: Cucumbers!