The series revolves around Evie Ethel Garland, a young girl who discovers on her thirteenth birthday that her father is an alien named Troy, from the planet Antareus, who married her mother and "merged lifeforms" to create Evie. Evie's half-alien heritage gives her superhuman abilities. Most of the episodes revolve around Evie misusing her powers and causing some trouble, which she spends the rest of the episode trying to fix. Only Evie and her family know about her alien father and her powers, and many episodes depict Evie trying to hide her secret from other characters. The series ended on a cliffhanger in the Season 4 finale, where Troy came to visit and Donna took his place by accident and ended up in Antareus, leaving Troy stranded on Earth.