Giant spiders
Jeff and Velma Green's Species in the show, as well as one of

Billy's worst fears.

In "Jeffy's Web" Jeff was show to have thousands of spider eggs.


Giant Spiders

Jeff is a giant spider with the ability to speak and behave like a human. Other giant spiders are seen in Wrath of the Spider Queen.

Half Spiders

Half Spiders have the upper body of a non-spider (such as a human in Velma's case) and the lower body of a spider.



In Wrath of the Spider Queen the spiders took over the school and cocooned everything in it.. In a flashback, Velma Green summoned spiders for her audition and they attacked the audience. One spider cocooned a victim and another spider came down from a web and grabbed the cocooned victim away.

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