Sometimes a Sequel is just the same story as the last one (Capcom Sequel Stagnation), or downgraded by being Direct to Video (Starship Troopers II), or a different story set in the same world (The Godfather II, the Star Trek films), or just the next part in an ongoing series (Star Wars, Lord of the Rings books and movies), or even a Dolled-Up Installment (Super Mario Bros. 2). Take an action sequel, which has more explosions and fist/gun/martial arts fights than the previous film. Or a slasher sequel, which has more deaths, in more gory (and less realistic) ways.