Kara, devastated by loss of Krypton struggles to adjust her new life on Earth. Superman mentors her. Meanwhile, she must contend with a mysterious group called the Dark Circle who searches for a powerful weapon held in the Academy's vault.

It's up Wonder Woman, Supergirl, Batgirl and Bumblebee at Super Hero High to stop Dark Opal from stealing their valued possessions to form the ultimate weapon!

After losing a powerful orb, Kara Zor-El, Superman's cousin, comes to Earth to retrieve it and instead finds herself up against a wicked witch.