This page contains The Grim Adventures Of Billy And Mandy Unlockables for Gamecube called "Alternate costumes" and has been posted or updated on Nov 21, 2006 by chloej.
- Developer: Midway
- Publisher: Midway
- Genre: Action Beat-'Em-Up
- Release: Sep 25, 2006
- ESRB: Everyone 10+
You have to finish Story mode with any character to unlock an alternate costume for that person.
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