Under the Metropolitan Sun is the official theme song for the franchise sung by Jordyn Kane feat The Sad Truth. A shortened version of 19 seconds is played before every webisode of the cartoon series as an intro, and an altered version of a minute played before Super Hero High, featuring more of the characters.
♪ I could get used to this save the day alarm
I can feel every day, I'm a little bit stronger. I only wish each day was longer.
Yeah, we're having fun in the sun. (the Metropolitan sun!) Week after week It's just like we're on vacation
Yeah, now our journey's begun. Friends 'til the end, Number one's our destination.
Under the Metropolitan sun... Hero Girls! ♪