Wanda Cousteau is a fish explorer who debuted on Sesame Street in a season 24 episode. Wanda wears a diver's helmet filled with water, so she can explore on land. As she explains it, "My mission is to explore strange new worlds, to seek out new life and new civilizations -- to boldly go where no fish has gone before!," a phrase she would often use (with variations depending on what she was exploring). Wanda became a recurring character the following season, with redesigned fins. Though she disappeared following the 90's, the puppet made a return appearance in a season 40 episode, performed by Joey Mazzarino.
Wanda's last name is a reference to underwater explorer Jacques Cousteau. In a season 25 episode, Big Bird introduces Wanda as "A Fish Called Wanda," a reference to the film of the same name. Wanda's mission statement is a reference to the opening narration from Star Trek.