You will Watch The Grim Adventures Of Billy and Mandy Season 4 Episode 8 online for free episodes with HQ / high quality. Stream cartoons The Grim Adventures Of Billy and Mandy Episode 47 Jeffy’s Web: When Billy gets under his house’s foundation, he encounters again his “son”, Jeff the Spider, who has just laid eggs. Then, Jeff tries to make things right with Billy so he can take care of the baby spiders, as he is going to die after the eggs hatch. Naturally terrified of seeing Jeff, Billy runs away and a wild car chase ensues. In the end, the eggs hatch, and Grim decides to refill Jeff’s hourglass that represents his lifetime so he doesn’t die, and so he can continue to scare Billy.