t must be tough out there for a female superhero, especially when she's clingy and moody like Uma Thurman's character in "My Super Ex-Girlfriend." Equal parts "Fatal Attraction" and "The Simpsons, My Super Ex-Girlfriend is often witty but the plot bumps along like a load of of kryptonite.

Luke Wilson, in a role his brother Owen would more normally be suited for, is Matt Saunders, a dweeby designer looking for love. Early if the film, he is pressured by his Vaughn (RainnWilson, of the "The Office") into hitting on a a mousey art gallery curator (Uma Thurman) on the subway. Only after he gallantly chases after the guy who steals her briefcase does Jenny Johnson accept Matt's offer of a date. "I have to help people every day, but no one has ever helped me but you," she coos.

Matt and Jenny end up going out and becoming amorous, even though Matt is secretly yearning for his co-worker Hannah (Anna Faris, of the Scary Movie franchise), who unfortunately for Matt is dating an underwear model. Jenny, who exhibits a number of nerve-wracking qualities, falls a bit too hard for Matt, but still reveals that she is G-Girl. Worse than that, she's neurotic and possessive.

Yep, she's faster than a speeding bullet. More powerful than a mighty locomotive. And able to emblazon the word “Dick” across Matt's forehead using laser-beam vision. When Matt soon tries to gently break off the affair, it's only a matter of time before the jealous and controlling G-Girl goes ballistic, spending the rest of the film making life miserable for him. She uses super-breath to strip him nude in the middle of an important business presentation, she throws a great white shark into his apartment, snapping at his genitals. And on it goes.