After foiling a purse snatcher who tries to steal Jenny Johnson's (Uma Thurman) purse on the subway, Matthew Saunders (Luke Wilson) becomes Jenny's "hero" and starts dating this shy stranger. After several dates, Jenny displays increasingly neurosis and aggressive behavior, becoming more demanding and ultimately injuring Matt and destroying his bed the first time they have sex. Soon after, Jenny reveals to him that she is in fact the voluptuous blonde superheroine, ''G-Girl,'' who accidentally received powers such as flight, superhuman strength, speed, and senses, invulnerability, super breath, and heat vision after she was exposed to radiation from a crashed meteorite as a teenager. Jenny starts to become more controlling after she reveals her powers and Matt starts to lose his mind.