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.
- 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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