In many cases, the sequel continues elements of the original story, often with the same characters and settings. A sequel can lead to a series, in which key elements appear in a number of stories. Although the difference between more than one sequel and a series is somewhat arbitrary, it is clear that some media franchises have enough sequels to become series, whether originally planned as such or not.
Sequels are attractive to creators and to publishers because there is less risk involved in returning to a story with known popularity rather than developing new and untested characters and settings. Audiences are sometimes eager for more stories about popular characters or settings, making the production of sequels financially appealing.
If the main character dies at the end of the first work, a new character (perhaps a son or daughter, or a supporting character) may take up the role in the sequel. In other cases, the main character is simply brought back, or determined not to have died, or simply replaced by a new character.
In movies sequels are usual. Sometimes sequels has special title (like Dark Knight, sequel of Batman Begins) but sometimes they only put a number to the original movie (like Spiderman 3).
Another example is Tom Stoppard's play Rosencrantz and Guildenstern Are Dead, which focuses on two minor characters from Shakespeare's play Hamlet, including events from Hamlet seen from their perspective.
A sequel to a popular – but discontinued – television series may be produced in another medium, thereby bypassing whatever factors led to the series cancellation. Noteworthy examples include the Star Trek films, Serenity (based on the Firefly series), and Twin Peaks: Fire Walk with Me. The Buffy the Vampire Slayer television series was continued after cancellation for another "season" as a comic book. The Buffy series was itself a continuation of the unsuccessful film Buffy the Vampire Slayer. The Gargoyles television series' comic book series, written by series creator, Greg Weisman, was written with a specific agenda to supplant the events of the television property's derided Goliath Chronicles phase.
Some highly popular movies and television series have inspired the production of multiple novel sequels, sometimes rivaling or even dwarfing the volume of works in the original medium. An ongoing series of novels (largely interquels) begun in the 1970s were based on the original Star Trek series, with more following with the sequel films and TV series. The novels and graphic novels in the Star Wars Expanded Universe are sequels, prequels, and interquels to the films.
Computer games are an increasingly common medium for sequels to films. The Matrix Online, Stranglehold, and Scarface: The World is Yours are sequels to the films The Matrix, Hard Boiled, and Scarface, respectively.
Whether these alternate-medium sequels are considered canonical varies. Bungie Studios, the developer of the Halo video games, considers the novel sequels to be canonical. The novels in the Star Wars Expanded Universe are considered canonical by Lucasfilm, the films' production company, though this is often debated amongst fans. Likewise, novel sequels to the film Blade Runner are authorized and officially considered canonical, but the issue is also a topic of debate amongst fans.
In the early years of film, sequels were generally given titles similar to the original and usually made use of the main character's name. When the William Powell-Myrna Loy mystery film The Thin Man (1934) turned out to be a hit, the studio produced several more films featuring the characters, such as After the Thin Man and The Thin Man Goes Home, even though the original "thin man" was the subject of the mystery and not the detective. After the success of A Family Affair (1937), there came a whole series of films starring Mickey Rooney reprising the Andy Hardy character in titles such as Love Finds Andy Hardy and Andy Hardy Meets Debutante.
The James Bond franchise, however, stuck to the titles of Ian Fleming's novels until they ran out, then fashioned new titles with similar forms, none of which use the name "James Bond 007" or a number. The Pink Panther series started out with a different title for each (The Pink Panther, A Shot in the Dark, Inspector Clouseau) in the 1960s. When the series was later resumed, the new approach was to append phrases to The Pink Panther, many of which came from classic horror films, i.e. Son of Frankenstein, The Mummy's Curse. Even if the actual Pink Panther diamond that the series takes its name from is not involved in a given sequel, they were named The Return of the Pink Panther, The Pink Panther Strikes Again, Revenge of the Pink Panther, Trail of the Pink Panther, Curse of the Pink Panther, and Son of the Pink Panther to clearly associate them with each other.
Numbered sequels (particularly using Roman numerals) became very popular in films and video games in the 1970s and 1980s. The Godfather Part II (1974) was the first major motion picture to use Part II in the title. The success of The Godfather, Part II began the Hollywood tradition of numbered sequels; the first sequel to designate itself as such simply by using a number in the title was 1975's French Connection II, and the trend continued with films such as Rocky II, Jaws 2 and Halloween II. Occasionally, a homophonous word is substituted for the number, such as in the case of Look Who's Talking Too, the sequel to Look Who's Talking, or the upcoming film Fletch Won, which is a prequel to the film Fletch. As sequels developed a reputation of being inferior to the original works, the numbering of sequels became less common, or sometimes used for humorous effect. Naked Gun 33⅓: The Final Insult is simply the third in the Naked Gun series. Leonard Part 6 had no predecessors, while History of the World, Part I was made with no intention for a sequel. Many sequels use subtitles instead of numbers or in addition to them, such as Resident Evil: Apocalypse, Underworld: Evolution, X-Men: The Last Stand, and Star Trek II: The Wrath of Khan. In other cases, sequels use titles similar to their predecessors, such as Analyze This sequel Analyze That, Meet the Parents sequel Meet the Fockers, and Night of the Living Dead sequel Dawn of the Dead. Some such titles give a playful nod to the numbering practice, as with The Whole Nine Yards sequel The Whole Ten Yards, or Ocean's Eleven sequels Ocean's Twelve and Ocean's Thirteen.
Throughout this period of numbered sequels, like-named sequels remained somewhat popular, and sometimes the original film was renamed when it was released on home video to match the naming of the sequels. What was once known as Star Wars is now known as Star Wars Episode IV: A New Hope. Similarly, Raiders of the Lost Ark is known in its current video release as Indiana Jones and the Raiders of the Lost Ark to better align it with its prequel and sequel, and the DVD of Pitch Black was renamed The Chronicles of Riddick: Pitch Black to help promote it as a predecessor to its sequel The Chronicles of Riddick.
With the rise of pre-planned series such as The Lord of the Rings, filmmakers turned more to long titles that include the franchise name and the title of the film separated by a colon. Examples of these include Pirates of the Caribbean: The Curse of the Black Pearl and The Chronicles of Narnia: The Lion, the Witch and the Wardrobe.
Sequel-naming in translation varies. Following the success of Home Alone in Germany (German title: Allein zu Haus, or Alone at Home), some of Macaulay Culkin's other films were retitled to capitalize on the success (Uncle Buck became Allein mit Onkel Buck, or Alone with Uncle Buck), even though the two films were not linked in the same continuity. When Dawn of the Dead was released in Italy under the title Zombi, a similar but unrelated Italian film was in production, which was released as Zombi 2.
Numbers in the titles of sequels sometimes indicate the order in which the sequel was produced, regardless of the chronological events in the story. For example, the video game Devil May Cry 3 was the third title in the Devil May Cry series to be produced, though it is a prequel that takes place before the events of Devil May Cry and Devil May Cry 2. The upcoming Devil May Cry 4 is an interquel set between the original game and Devil May Cry 2. However, while the sequel to the Japanese movie Ring was called Ring 2, the subsequent prequel was Ring 0.
Occasionally a work is designated as a sequel to an unrelated but similar work strictly for marketing purposes. After releasing the computer game Quake, developer id Software decided to name its next game Quake II, despite the fact that the two games are completely unrelated. Quake III is also unrelated to either of the previous Quake games, although Quake 4 continues the story of Quake II.
In recent years, many sequels have been given the name of the title character, to imply a new beginning for a series. This is commonly known as a "Stallone," for the actor who has given such outstanding examples of this nomenclature. The sixth Rocky film was titled Rocky Balboa; the fourth Rambo movie, following on from First Blood, Rambo: First Blood Part II, and Rambo III was called Rambo. Another example of a film to utilize a "Stallone" is the sixth St Trinian's film, titled St. Trinian's.