Transfer at his absolute worst, the sound effect of his eye glowing is also unnerving.
In the fifth episode Brigadier Corn is almost eaten alive by orca whale.
In the famous ninth episode of Romy's rescue; the Kali worshipers and their ominous chanting.
It doesn't help that it gets louder when Princess Romy is almost burned alive.
The eerie screeching danger theme heard in the several episodes.
Willy Fog 2
Romy and Lidenbrock getting harassed by subterranean vampire bats. Doesn't help that they also have red eyes and fly almost silently.
All of the prehistoric monsters in the center of the earth, especially the giant green lizard who attacks Mr. Fog; it growls and drools like a rabid dog.
Nautilus in its debut; just an ominous shadowy creature which rams into ships.