The zombie spider (usually a cellar spider) is infected by an entomopathogenic fungus. The spider can, for a little while, survive while the fungus eats through its tissues. While this is happening, the spiders survive in a zombie-like state. Once dead, the fungus can spread to other nearby spiders

Batman: The Animated Series, S01E Harley and Ivy (1992—1995), directed by Boyd Kirkland #𝓬𝓲𝓷𝓮𝓶𝓪𝓽𝓱𝓮𝓺𝓾𝓮