High Quality Content by WIKIPEDIA articles! The Wonder Twins, Zan and Jayna, are fictional extraterrestrial comic book superheroes published by DC Comics. Their first comic book appearance was in Super Friends #7 (October 1977), by E. Nelson Bridwell and Ramona Fradon. A modernized version of the twins debuted in Extreme Justice #9 (October 1995), by Ivan Velez and Al Rio.