Skritch is a guest villain in the show and vocied by Keith Szarabajka.  He appeared in "The Substitute," where he announced that the Gromble had "gone away" and offered to substitute him.  He even allowed them to engage in garbage fights, until Oblina suspected him as a bad influence, including a running gag of the substitute failing to pronounce her name.  A chase ensued, until Oblina fell into a sewer below, presumed to have drowned. Skritch continued to imprison the monsters, even the Gromble, until Oblina showed up, having survived the river, dressed in ninja gear, and dueled with the substitute, until he was arrested for fraud.

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