Two things.
First- Farscape is a tv show and NOT a movie like your title asks for. And while Farscape is a great Sci- fi show NOTHING beats out Deep Space Nine for a sci-fi, or any other type tv show for that matter, in terms of being great. best character you'll ever see on TV or the movies os the "plain and simple tailor" Garak.
Now, if you're talking movies it is Star Trek II- The Wrath of Khan!!