Thousands of years ago on his homeworld, Planet Kron, Krag ruled over his people with an iron fist, but was then trapped inside the Twilight Cage, along with with his people and their civilization. Some time after arriving there, Krag and his people were invaded by the Nocturnus Clan, but Krag refused to give into their leader Imperator Ix's demands. The Kron were eventually conquered by the Nocturnus Clan and Krag was forced into a life of servitude for the Nocturnus Clan. The "gritty taste" of the life as a slave caused a change in Krag and he became a fair leader over his people.
Krag also set up the meeting to invade Nocturne. He commented that they were in war with Ix, and that Sonic liberating the Kron factory would accelerate this war. At one point, you can have Sonic comment that they didn't want a war, to which Krag answers that there already was one.
|Sonic Chronicles: The Dark Brotherhood|
|Playable characters||Sonic | Tails | Amy | Knuckles | Rouge | Big and Froggy | Cream and Cheese | Eggman | Shadow | Omega | Shade | Super Sonic|
|Other characters||G.U.N. | Commander | Nocturnus Clan | Ix | Nestor | Super Ix | Gizoids | Emerl | Scylla | Charyb | Knuckles Clan | Egg Bot | Swatbot | Krag | Syrax | Raxos | Haniman | Queen N'rrgal | Thebes | Thelxe | Overmind | Twilight Cage Pirates | Precursors | Chao | Argus | Vector|
|Places||Green Hill Zone | Central City | Blue Ridge Zone | Mystic Ruins | Angel Island | Metropolis | Metropolis Ground Zero | Kron Colony | Twilight Cage | Zoah Colony | N'rrgal Colony | Voxai Colony Alpha | Voxai Colony Beta | Nocturne|
|Other||Dexter | Argus event | Sequel | Archie Prequel|