17. Barbarella (1968)
Director: Roger Vadim
Stars: Jane Fonda, John Philip Law, Anita Pallenberg, Milo O'Shea, Marcel Marceau
With the endlessly watchable Barbarella, "worst" is a loose term. The film's air of robust cheese is unavoidable, ripe with '60s campiness, silly-looking outer space sets, and a bizarre sense of humor that's never as funny as it is endearingly unsubtle.
All of Barbarella's faults are easily dismissed whenever star Jane Fonda is on screen, though, which happens for the majority of the movie's running time. An overt sex object dressed in skimpy outfits and written into provocatively physical situations (see above), Fonda's title character—a government rep who heads from Earth into another galaxy in order to find a missing inventor—is the ultimate dreamgirl for tech geeks, comic book heads, and other kinds of pre-pubescent nerds. In other words, guys who couldn't care less that she's in a not-so-good movie.