The Powerpuff Girls are expanding their ranks with the addition of an all-new fourth member to the group. This new member will provide them with a helping hand to fight crime in their new film.

Cartoon Network is all prepped up to unveil the yet-to-be-disclosed name of the fourth Powerpuff girl in the premiere episode of the five-part movie event, The Powerpuff Girls: Power of Four, to be aired Sunday, September 17, reports Entertainment Weekly.

Some fans, however, were quick to point out that a fourth member will add no new flavor to the film. The girls had already created a sister in an old school episode.