The duo made their debut in "The All-New Super Friends Hour" and then appeared in "The World's Greatest Super Friends", "Super Friends", and "". Zan (voiced by Michael Bell) and Jayna (voiced by Louise Williams from 1977-1983 and B. J. Ward in 1984) are siblings from the planet Exxor (also spelled Exor) who were being informally trained by the superheroes. Unlike their predecessors, Wendy Harris and Marvin White, this pair was able to participate in combat with abilities of their own.