Sector Charybdis, also called Sector Charyb, is one of the two known named regions of the Twilight Cage, the other being Sector Scylla. It appears in Sonic Chronicles: The Dark Brotherhood, where it is visited by Sonic the Hedgehog and his team during Chapter 9.
Sector Charybdis is an area of the empty void of the Twilight Cage that encompasses the Voxai Colony Beta and Voxai Colony Alpha, two large planetoids torn from Planet Kron, which originate from an unspecified dimension outside of the Twilight Cage.
Sector Charybdis is dominated by the Voxai's territory, with the Voxai's two planetoids occupying this region. During the events of Sonic Chronicles: The Dark Brotherhood, Sonic and his team used the Cyclone to visit Sector Charybdis, first arriving at Voxai Colony Beta and later Voxai Colony Alpha. During their visit to this sector, Sonic and his team managed to collect the two Chaos Emeralds placed in this sector by Imperator Ix and stopped the power-mad Overmind from controlling its people, while gaining the Voxai as their allies as well.