Along with Aku, Kazl and Zyke targeted Jack and Ruth Brody in 1981 after the couple retrieved some ancient potions from Egypt. The demons wanted to use the potions to protect themselves from the Avatars, so they attacked Jack and Ruth at an airport warehouse and killed them. In the struggle, the potions were destroyed, so the demons retreated. In 2005, Zankou lured Kazl and Zyke to his lair, where they were confronted by Kyle Brody for killing his parents. Zankou then vanquished the demons to gain Kyle's cooperation in his fight against the Avatars.