Not willing to let go of Jack from her life, Carly decides to find out more information regarding the other Signers starting with [[Akiza Izinski]] and the [[Arcadia Movement]], of which she comes across [[Misty Tredwell]] in their records. During an interview, Misty warns Carly not to investigate the Movement and that it was responsible for the death of her younger brother. Nevertheless Carly goes to the Arcadia Movement and finds information regarding Rex Goodwin. She is spotted by [[Sayer]], who challenges her to a Duel. During the Duel, Sayer tells Carly that Rex Goodwin was once a resident from Satellite. She loses after her first turn and is blasted out through the high story window by Sayer's monsters, leading to her death (in the English dub, Carly fell into a purple fog; however, the crater she landed in is still evident).

[[File:Carly signer.jpg|thumb|right|Carly as a Dark Signer.]]

After her fall, the hummingbird [[Mark of the Shadows|mark]] starts glowing on her arm, reviving her as one of the [[Dark Signers]]. After her transformation, her personality changes, soaking her with vengeance. She challenges Sayer to a Shadow Duel for revenge. In this Duel, she knocks him through the wall, leading to the stairwell using her [[Earthbound Immortals|Earthbound Immortal]] and makes him fall the entire length of the building.