she is filburt's crazy grumpy aunt. she never came out of her tank, so as an adult, she has her arms and legs sticking out of it and water sloshing on everyone she passes. she appears in "sugar frosted frights", where it's revealed that she babysat young filburt and told him all kinds of horror stories about halloween, contributing to his fear of halloween. crazy aunt gretchen hates halloween. she then later attended filburt and dr. hutchison's wedding in "the big answer." she gets electrocuted by an o-phone in "static cling". crazy aunt gretchen is voiced by linda wallem.