Looks like one of Jimmy Neutron's incomplete inventions A.K.A a Stub.
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Lake Retroville is a man-made lake in Retroville that was once haunted by a monster. After Jimmy, Carl, and Sheen manage to return the monster to normal, the lake turns back to normal.

Lake Retroville only appears in "Monster Hunt," although it might have also appeared in Attack of the Twonkies in the level Frozen Lake Boss.


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