The Grim Adventures Of Billy And Mandy - Platform: Wii

Concept art:
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Hold 1 and press Up two times, Down two times, Left, Right, 
Left, Right at the main menu. 

Play as Boogey:
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Successfully complete Mission 9 in Tier 4 in Mission mode.

Play as Chicken:
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Successfully complete Story mode as all characters and accumulate 
10 hours of game play. 

Play as Dracula:
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Successfully complete Mission 5 in Tier 3 in Mission mode. 

Play as Eris:
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Successfully complete Story mode as Billy, Mandy, Grim, or Irwin. 

Play as Fred Fredburger:
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Successfully complete Story mode as Billy, Mandy, Grim, or Irwin 

Play as General Skarr:
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Successfully complete Mission 6 in Tier 4 in Mission mode. 

Play as Hoss Delgado:
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Successfully complete Mission 9 in Tier 1 in Mission mode.

Play as Jack O'Lantern:
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Successfully complete Mission 9 in Tier 2 in Mission mode. 

Play as Lord Pain:
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Successfully complete Mission 9 in Tier 5 in Mission mode. 

Play as Nergal Jr.:
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Successfully complete Mission 9 in Tier 3 in Mission mode. 

Play as Nergal:
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Successfully complete Story mode as Billy, Mandy, Grim, or Irwin. 

Play as Nerglings:
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Successfully complete Story mode as all characters. 

Alternate costumes:
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Successfully complete Story mode with any character to unlock an
alternate costume for that person. When you complete Story mode with 
a character that has a costume and you destroy the credits, Mandy 
will be in a costume.