Firemen exposed to the gas. Joker venom is a deadly toxin used by the Joker. It causes anyone who inhales it to laugh uncontrollably until the point of death, leaving them with a permanent grin on their faces. Sightings Edit Season 1 14. "Revelation" Known users Edit Joker References Edit ↑ Hopps, Kevin (writer) & Chang, Michael (director) (October 14, 2011). "Revelation". Young Justice. Season 1. Episode 14. Cartoon Network. Retrieved from "https://youngjustice.fandom.com/wiki/Joker_venom?oldid=233676" Categories: A to Z Equipment Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.