Jonny Quest (1964)

S01E16 The Fraudulent Volcano

Title: The Deceptive Volcano Plot: During their exploration of strange seismic activity on a tropical island in the South Pacific, Dr. Quest and Race stumble upon a concealed ray gun facility run by Dr. Zin. This hidden base is cleverly situated inside a volcano and is fiercely guarded by hovercraft-equipped sentinels, posing a significant challenge for our heroes as they delve deeper into the mystery.