Vital statistics
Species Spider
Series The Grim Adventures of Billy & Mandy
Location Prankster's Island
Voiced by Maxwell Atoms
Jeffrey "Jeff" the Spider is an extremely generous spider who supposedly is the son of Billy, since Billy is the one who hatched him from his egg. Since Billy hates bugs, especially spiders, he repeatedly tries to kill Jeff, despite his kindness. His best friend is Fred Fredburger and both of them now work for a superhero team called "Underfist" along with Hoss Delgado and Irwin.


Jeff is making babies so he can spread them throughout the whole world. He is also in a mission to investigate the island for a thing called the Fire Engine.


  • Jeff was engaged to and almost married Velma Green the Spider Queen, but he later broke it off.