Dexter's Laboratory (1996)

S1E2 Dial M for Monkey: Magmanamus

Monkey faces the daunting challenge of protecting the city from a colossal underground lava creature known as Magmanamus. This fearsome beast is unable to rest due to the constant clamor of the townsfolk. With the city's safety hanging in the balance, Monkey must find a way to silence the noise and restore peace, all while keeping the terrifying monster at bay.