Home PC Playstation 3 Wii Xbox 360 Top Cheats Latest Cheats Top Categories Forum Search Search Cheats Jebo Network Jebo Avatars Jebo Chat Jebo Chords Cheats Jebo Screenshots Jokes Guitar Lessons Home > Wii > Grim Adventures of Billy and Mandy > Unlock Nergal You have selected the following cheat: Unlock Nergal. Unlock Nergal Finish "Story Mode" once with either Billy, Mandy, Grim, Or Irwin Other Cheat for This Game Home > Wii > Grim Adventures of Billy and Mandy > Unlock Nergal If you find any problems with the video game cheats on this site please feel free to contact us..