This page contains SpongeBob SquarePants: Underpants Slam Unlockables for Xbox 360 called "Unlock Plankton" and has been posted or updated on Mar 12, 2008 by game333. Let us know what you think of this Unlockable by thumbs voting.
- Developer: Blitz Arcade
- Publisher: Thq
- Genre: Action
- Release: Dec 26, 2007
- ESRB: Everyone
Beat all 9 Quest levels on any difficulty to unlock Plankton as a playable character.
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