Watch The Grim Adventures of Billy and Mandy Season 6 Episode 21 Online with Multi Subtitles - OnionPlay

Watch Watch The Grim Adventures of Billy and Mandy Season 6 Episode 21 Online with Multi Subtitles - OnionPlay on OnionPlay - When Billy finds his "son" Jeff Spider lying in his bed with "Spider Pox," he goes to Mandy for help to get rid of the giant spider. Ignoring Billy, the next morning, Mandy wakes up affected by Spider Pox as well, developing four extra arms and the ability to produce spider silk. Mandy's condition progresses, and she completely transforms into a giant spider, capturing Billy's parents and Grim. Grim tells Billy that to cure Mandy, he must use the venom of the spider that infected her. Although Billy successfully administers Jeff's venom to Mandy, he has also carried the virus and infected the townspeople, who have all turned into spiders.