Aaahh!!! Real Monsters (1994)

S4E19 Spy vs. Monster

When a human spy is uncovered, the Academy goes into lockdown. While hiding, Ickis notices that he has left behind a drawing of The Gromble in the hallway. The spy finds it and inadvertently drops one of his own confidential papers. Seizing the opportunity, Ickis, along with Krumm and Oblina, uses the document to locate the spy's headquarters and orchestrates a plan to retrieve the stolen files.