The Grim Adventures Of Billy And Mandy Play as Boogey
Successfully complete Mission 9 in Tier 4 in Mission mode to unlock Boogey.
Play as Chicken
Successfully complete Story mode with all characters and accumulate 10 hours of game play time to unlock Chicken.
Play as Dracula
Successfully complete Mission 5 in Tier 3 in Mission mode to unlock Dracula.
Play as Eris
Successfully complete Story mode with Billy, Mandy, Grim, or Irwin to unlock Eris.
Play as Fred Fredburger
Successfully complete Story mode with Billy, Mandy, Grim, or Irwin to unlock Fred Fredburger.
Play as General Skarr
Successfully complete Mission 6 in Tier 4 in Mission mode to unlock General Skarr.
Play as Hoss Delgado
Successfully complete Mission 9 in Tier 1 in Mission mode to unlock Hoss Delgado.
Play as Jack O’Lantern
Successfully complete Mission 9 in Tier 2 in Mission mode to unlock Jack O’Lantern.
Play as Lord Pain
Successfully complete Mission 9 in Tier 5 in Mission mode to unlock Lord Pain.
Play as Mogar
Successfully complete Story mode with Billy, Mandy, Grim, or Irwin to unlock Mogar.
Play as Nergal
Successfully complete Story mode with Billy, Mandy, Grim, or Irwin to unlock Nergal.
Play as Nergal Jr.
Successfully complete Mission 9 in Tier 3 in Mission mode to unlock Nergal Jr.
Play as Nerglings
Successfully complete Story mode with all characters to unlock Nerglings.
Play as Pumpkin
Successfully complete Story mode and deal out a total of 100,000 damage points to unlock Pumpkin.
Play as Vikings
Successfully complete Story mode with all characters and destroy every letter in the credits sequence to unlock Vikings.
Alternate costumes
Successfully complete Story mode with any character to unlock an alternate costume for that person.