Joker venom

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.[1]


Known users


  1. Hopps, Kevin (writer) & Chang, Michael (director) (October 14, 2011). "Revelation". Young Justice. Season 1. Episode 14. Cartoon Network.