Beautiful (but lonely) Jenny Johnson’s (Thurman) alter ego is super-heroine G-Girl, protector of New York City. One day, Matt (Wilson) spots Jenny on the subway and asks her out. A romance quickly blossoms. But, Matt soon learns Jenny's peccadilloes - she turns out to be a "trifecta": vindictive, jealous and manipulative.
Even after finding out Jenny’s alter-ego, Matt bails. But Jenny's not so willing to let go and uses her powers to exact revenge (such as biffing a great white shark through his new lady friend’s window).
Film wears it's cheesy effects on it's sleeve and is said to "address the true questions we'd ask if superpowered. What is superhero sex like? Would we get back at that date who never called again? Would we fry his goldfish with our X-ray vision?"