Starlight begins as a spy/helper for Scratch Cat but is Eventually corrupted and becomes Stalk, who takes scratchers into his code world where he keeps them until he brings them to Dark Scratch Cat, who corrupts them. When Starlight is corrupted there should be a scene where it shows Starlight's mind and Starlight is pushing against Stalk but Stalk wins and gains control. @ArtOmega264 look inside for sounds and instructions for animating.
Thanks to @Stegasaur7797 for showing me this movie.