Prefect Scylla (スキュラ・ザ・ギゾイド Sukyura za Gizoido?) is one of the two Prefect Gizoids of the Nocturnus Clan, the other one being Charyb. Scylla uses fire-based attacks to take down his opponents. He faced Knuckles' team on Nocturne in order to prevent them from draining the water in Charyb's lair, which would allow Sonic's group to defeat him. Although he was powerful, they managed to defeat him and assist Sonic's team.
Scylla is the opposite of Charyb; playful and and mischievous. He was said to have been "always a madman" by Shade, which is proven by his maniacal laughter in almost every sentence and his eyes lit as if one eyelid is partially closed. Scylla also insults Knuckles by calling him a porcupine when his team first encounters him, but correctly refers to him as an echidna later (this is partially a reference to one of Knuckles' theme songs).
- "Madman? Hehehe. Silly Shade. I'm not a man. I'm your destroyer!" - Scylla answering to Shade calling him a madman.
- Prefect Scylla is named after the fire beast Scylla, from the Greek mythology story "The Odyssey".
- One of the sections of the Twilight Cage is named after Scylla