Twilight Cage

The Twilight Zone (aka the Twilight Cage) is an alternate zone comprised of vast barren wastelands, darkness and space, where time flow is roughly one quarter the speed of Mobius Prime's. When the Dark Legion began their attacks on Echidnaopolis, the current Guardian of the time, Steppenwolf, used his vast knowledge of Chaos energies to banish Menniker and the rest of the Dark Legion to the Twilight Zone. There the Dark Legion continued to live for centuries, periodically making brief escapes only to be returned to the confines of the zone. When Dr. Ivo Robotnik fired the Ultimate Annihilator, the weapon weakened the dimensional barriers, allowed the Dark Legion to escape once and for all. (StH: #50, #205 KtE: #1, #2, #3, #17, #18)

Years later, the surviving members of the Brotherhood of Guardians and Moritori Rex were dumped in the Twilight Zone by Dr. Finitevus once he had completed his studies of them. (StH: #183)

Background information

 * It is likely that the Twilight Zone was the inspiration for the Twilight Cage in Sonic Chronicles: The Dark Brotherhood, as it shared many similarities. The Twilight Zone was even mistakenly called the Twilight Cage in 2009's Sonic Free Comic Book Day Special, possibly because Ian Flynn is trying to make the comic and game universes as similar as possible during his tenure as writer and has renamed the Twilight Zone to mirror the game version.
 * It is also likely that it was named after the 1959 Science-fiction TV show made by Rod Serling called The Twilight Zone. By coincidence, William Windom (the voice of Uncle Chuck in SatAM) appeared in that show.