DC Super Hero Girls is a franchise developed by Mattel along with DC comics and Warner Bros. The brand is focused on getting girls aged 6 to 12 interested in the world of superheroes by using some of the universe's most well known heroines and villainesses and turning them into teenagers. DC Super Hero Girls is also the third in a line of franchises that include Monster High and Ever After High.
The franchise was first announced on April 23rd, 2015, by Mattel and DC Comics who had decided to work together for this franchise. The aim they set was to get girls aged 6-12 interested in comics, and have used teenage versions of well known heroines and villainesses to accomplish that. With the announcement the seven main characters for the franchise were revealed, these being: Supergirl, Wonder Woman, Batgirl, Harley Quinn, Poison Ivy, Bumblebee, and Katana. Promotional art for the franchise was also revealed, showing the main characters. There was also a range of products announced as well including the two main toy lines of dolls and action figures, as well as TV specials and a series of shorts all of which would roll out in the fall of 2015 and into spring of 2016.
On July 7th, 2015, the franchise's official website was activated by Mattel and DC. The site showed off stats and general descriptions for the main characters. It was also revealed at San Diego comic con that Shea Fontane would be writing for the webisode series and a graphic novel that's going to be released in July of next year.
On September 30th, 2015, the site was fully updated in prep for the launch of the franchise, with games, pictures, character descriptions, toy pages, and video pages being uploaded, as well as more detailed character profiles and new characters. The next day on October 1st the first webisode was released: Welcome to Super Hero High.
When New York comic con hit around October 8th and 9th, a music video was released on the site, revealing the theme song for the franchise, as well as two more webisodes featuring Wonder Woman. The dolls were also first seen on October 8th, with dolls of Wonder Woman, Supergirl, Batgirl, Harley Quinn, Bumblebee and Poison Ivy being revealed for launch next spring.