After Krypton was destroyed, Kara was saddened and found it difficult to adjust to life on Earth.
Her cousin Superman tutors her and advises her to depart their space-time to enrol in the Legion Academy in the 31st century, where she meets new people and encounters Brainiac 5.
While the Dark Circle, a shadowy organisation, seeks for a potent weapon hidden in the Academy’s vault, she has to deal with them.