Fang was a testube baby, taken away from her family at age 2. She remembers nothing about them, and will never get them back.
That, she knows. And she suspects her parents were Scientists.
Her and her friends? All testube babies. Taken away from their family, tests run on them, being tortured by The Scientists. They're basically a family, the only one they've got.
When the evil Dr. Nudge goes looking for them, to add onto his army of mutant weirdos, set to help him rule the earth, they have to save the world while trying to stay out of reach of the crazy Scientist's clutch.