The Interim Villain introduces a new side of the story via providing a credible antagonist to challenge the characters, without taking anything away from the story in the same way that an Arc Villain might. It might take a while before the fans warm up to an Interim Villain, particularly if you go with the (unrecommended) route of a Suspiciously Similar Substitute.
As another cog in the Sorting Algorithm of Evil, an Interim Villain may range from anywhere between a Breather Boss (by comparison) to a Hero Killer, depending on the portrayal. They can be connected to the previous Big Bad, or they can be completely independent - it's your choice.
In order to spot an Interim Villain, their predecessor must still be at large (including situations involving resurrection or incarceration), and the Interim Villain themselves must return after their own defeat. Their significance to the plot can vary, but it's fine as long as they actually impact the story or characters in some way.
This still counts even when an Interim Villain is placed between the fall of the Disc-One Final Boss and the emergence of his successor. If you pick this scenario, it can sometimes lead to The Big Bad Shuffle.
Sub-Trope of Hijacked by Ganon. Compare Filler Villain (inconsequential antagonists meant to drag things along before the meat of the story returns), Villain of Another Story (whose misdeeds are irrelevant to the big bad's), Lone Wolf Boss (video game boss unconnected to the big bad), Giant Space Flea from Nowhere (video game boss only existing for the sake of game play) and Diabolus Ex Vacuus (villain who shows up without foreshadowing and is quickly removed from the plot).
- Bleach introduces these in both canon and in filler.
- Jin Kariya quickly took over the scene in the anime following Aizen's escape into Hueco Mundo in the previous arc. After Kariya was killed by the end of the Bount arc, Aizen returned for the Arrancar arc. What sets Kariya apart from an Arc Villain is how he returns as a vision to Ichigo, indirectly assisting in getting Ichigo to defeat his Inner Hollow.
- Kageroza Inaba really stretches the boundaries to such an extent that he himself is a Zigzagging Trope. He's a Filler Villain (in fact the last one), dragging the story along so the anime has more material to (eventually) adapt from the manga. He's an Arc Villain, since he never appears following the Invading Army debacle. At the same time, the anime made sure to give him some significance so it's not entirely inconsequential. He makes his debut after Aizen's incarcerated, takes part in causing Ichigo's powers to fully dissipate, and loses before we bare witness to Xcution. However, the most important piece of his legacy lies in the Dangai. When Aizen destroyed the Janitor, he caused immense time fluctuations within the Dangai; Inaba used it to his advantage versus Ichigo for a time, and the time fluctuations were fixed once he met his end.
- The canon example comes from Shukuro Tsukishima and Kugo Ginjo, filling out as villains between the defeat Aizen and the emergence of Yhwach.
- Death Note had the Yotsuba executives, one of whom was the third Kira, whose Death Note restored Light's memories as the original Kira and led to L's death.
- Ronin Warriors had some shmo take over as #1 Bad Guy for the handful of episodes after Tulpa was defeated and before he came back.
- Rave Master gives us Pumpkin Doryu, who is the primary antagonist between King's death and Lucia reviving Demon Card.
- Jojos Bizarre Adventure has a main villain in the form of Dio Brando, a human-turned-Vampire. In Part II, the main villains were the Pillar Men who were also Greater-Scope Villain for Part I. In Part III, Dio Brando returns, this time as DIO.
- Digimon Universe Applimonsters gives us Sateramon, who only temporarily takes up his predecessor's, Mienumon's, position as The Heavy before being finally defeated after only a few episodes (he didn't even appear in some of them). After him came Unryūji Knight who is implied by the second OP to be the last major henchmen of Leviathan. Well, not for long.
- Subverted with Sid Phillips in Toy Story 3, where even though he is the villain of the first film and is completely absent in the second, in the third he only appears as a cameo where he is now a garbage man.
- Done perfectly with the Joker in The Dark Knight. In the first movie Ra's al Ghul is the Big Bad and the leader of the League of Shadows. In the second movie, the League of Shadows is forgotten and the Joker takes over. In the third movie, the Joker is gone while the League of Shadows returns. Even though Ra's is dead, his daughter and Bane are here to finish his job.
- James Bond
- The title character of Goldfinger, the only villain from the Connery and Lazenby films who had no connection with SPECTRE.
- Also, in the new Daniel Craig movies, the Big Bad is technically Mr. White, though he disappears at the beginning of Quantum of Solace and is not even mentioned in Skyfall. In Quantum of Solace, we have Dominic Greene as the Big Bad while in Skyfall it is Raoul Silva's turn. Mr. White returned in the next movie Spectre. Ultimately, subverted in that the real Big Bad proved to be Ernst Stavro Blofeld and all the villains, including Mr. White, were muscle doing his dirty work.
- Marvel Cinematic Universe:
- The Avengers has Loki and Chitauri as the main villains, with the ending revealing that Thanos was the true Man Behind the Man who set everything in motion as part of a plot to claim the Infinity Stones. Thanos returns (this time in person) as the main threat of Avengers: Infinity War, the third entry in the series. While the second movie contains a continuation of the Infinity Stones subplot to some degree, it is Ultron who is the main villain, rather than Thanos or another of his underlings.
- Guardians of the Galaxy has Ronan the Accuser as the main villain, but like Loki he is backed by Thanos before the former decides to rebel against him. The Guardians appears in the aforementioned Avengers: Infinity War teaming up with the Avengers to face the Mad Titan himself. Prior to that the Guardians battle against Ego the Living Planet, Peter's father, and the main villain in their second movie, who not only lacks any affiliation with Thanos or his underlings, but also doesn't feature the Infinity Stones subplot in any degree, unlike Avengers: Age of Ultron.
- The first Pirates of the Caribbean movie had Hector Barbossa as the main antagonist, while Davy Jones becomes the prime villain for the second. In a subversion, Barbossa becomes the Sixth Ranger in the following film, Jones himself is Demoted to Dragon and Cutler Beckett (villain of the third movie) is the archetypal Big Bad for the original trilogy. As a further subversion in the fourth and fifth movies Barbossa leads a seperate faction that is antagonistic to the heroes but is not the Big Bad, and in both they get forced into Enemy Mine alliances.
- Star Wars: In the prequel trilogy, Darth Sidious is the Man Behind the Man for Nute Gunray and Rune Haako during Episode I. In Episode III, he establishes himself as the Galactic Emperor, wipes out the Jedi Order and reorganized The Republic into The Empire. In Episode II, he had a minor role (even as Chancellor Palpatine), whereas Count Dooku was given more screen time and treatment as a Big Bad, but in a subversion, Sidious was the one that pushed for the formation of Dooku's organization (the Confederacy), and intentionally placed Dooku as a scapegoat while he pulled the strings from the shadows. Furthermore, the threat of the Separatists prompted the development of the Clone Army, later known as the Imperial Stormtroopers.
- The third film also had another interim villain in the form of General Grievous, who takes over as leader of the CIS from Dooku when the latter is killed. Grievous mostly exists to serve as an adversary until Palpatine is confronted at last.
- The Artemis Fowl series takes this to some unusual extremes with the Big Bad of every even-numbered instalment being a returning Opal Koboi, and various unrelated villains each serving as the Big Bad for each odd-numbered book (except for the first book, where the Big Bad, essentially, is Artemis himself).
- Harry Potter examples:
- The Heir of Slytherin in Harry Potter and the Chamber of Secrets. Ultimately subverted when he ends up being Voldemort all along, albeit a piece of his soul working without the "real" Voldemort's knowledge.
- Peter "Wormtail" Pettigrew in Harry Potter and the Prisoner of Azkaban, the only book in which Voldemort does not appear and is only referenced as an off-page Greater-Scope Villain (although Wormtail's status as one of Voldemort's Co-Dragons makes this a downplayed example).
- Dolores Umbridge in Harry Potter and the Order of the Phoenix, for most of the book before Voldemort and the Death Eaters return and render her unimportant by comparison. Notably, this is the only book in the franchise where The Heavy for most of the book is not either Voldemort or The Dragon to Voldemort in some way (such as Quirrel, the Basilisk, Wormtail, Bartemeus Crouch Jr, or Snape).
- Done in Power of Three, the third arc of Warrior Cats. The Big Bad of the arc, Sol the traveler, leaves the lake about halfway through Long Shadows. The role of main villain is then shifted to Ashfur, in one of the biggest Wham Episodes of the series. This villain has a major effect on the heroes and even causes Hollyleaf's FaceHeel Turn, before being defeated and causing the characters who didn't know of Ashfur's villain status to bring Sol back to the lake and try him for Ashfur's murder. Interestingly enough, the villain of Power of Three ended up being an Interim Villain himself, meant to carry the story (and introduce massive changes) while Tigerstar and Brokenstar gathered their power to rise up in Omen of the Stars.
- The strongest Buffy the Vampire Slayer example is perhaps the Anointed One in season 2, who takes over for and tries to resurrect the Master, the previous season's Big Bad, and is subsequently used to introduce Spike... who promptly kills him.
- This happened fairly often: Mr. Trick was replaced by Faith and the Mayor, The Trio gave way to Dark Willow, Spike (season 2) was eclipsed by Angelus, etc.
- Doctor Who:
- During Russell T. Davies' tenure as showrunner, the Daleks were the main villains in the first and fourth series, while sharing and ultimately stealing the spotlight from the Cybermen in the second series. In the third, The Master takes over the limelight.
- In the Eleventh Doctor's era the main villains were the Silence, except for Series 7, where instead the Great Intelligence was the Big Bad for that season.
- Gotham: Unlike the other Big Bads found on season 3, Jerome Valeska is the only one to not use the Tetch virus for his crime and appears right in the middle of the season after the GCPD finally arrest Jervis Tetch and curing the city of his virus but right before the Court of Owls use said virus from their own nefarious plans.
- Power Rangers: In some seasons the first Big Bad's replacement turns out to be an Interim Villain, and the original comes back by the finale even though they were defeated earlier in the story.
- Power Rangers Lost Galaxy: Captain Mutiny.
- Power Rangers Wild Force: Mandilok.
- Power Rangers Zeo: Prince Gasket.
- Mighty Morphin' Power Rangers has a mild example with Rita's father Master Vile. Though the Big Bad Lord Zedd doesn't leave, Master Vile does usurp him as being in charge, due to being more evil and wiser. Master Vile leaves before the end of the season, allowing for Zedd to be back in charge.
- The BBC version of Robin Hood had the original Sheriff of Nottingham apparently killed off part-way through the third series, and replaced (both as Sheriff and as the show's main villain) by a Canon Foreigner named Isabella. Isabella was seemingly beaten in the penultimate episode, just in time for the original Sheriff to turn up as the head of Prince John's army in the Grand Finale.
- Storage Wars: Early in season three, Dave is kept off the show by other business interests. Filling his role as antagonist is Jeff Jarred, whose hook is that he believes that auctioneer Dan shows favoritism towards the more established buyers.
- In Season 2 of Twin Peaks, BOB suffers a setback (his host being discovered) that forces him into hiding. As the protagonists attempt to track him down, Wyndom Earle shows up to do the same while also committing a string of murders. The final confrontation with Earle also reintroduces BOB, who takes Earle's soul, saving Annie, but also takes over Cooper's body. Then the show ended. Two-and-half-decades later, BOB is the main villain of The Return, more active than ever.
- Daredevil (2015): Season 1 features Wilson Fisk as the main villain, with the Hand being first introduced as an associate gang of Fisk's. At the end of the season, Fisk is arrested and sent to prison. Season 2 focuses on the Punisher and the Hand, and the power vacuum that's opened up as a result of Fisk being arrested. Fisk even makes a brief two-episode arc where he takes a step towards rebuilding his criminal empire by using Frank to murder the head of a prison contraband gang who insulted him. He also begins investigating Matt after Matt threatens his relationship with Vanessa. Season 3 then returns to featuring Fisk as the main villain front and center, where we see that the events of his little season 2 arc were him biding his time as he waited for his long-term manipulations of Ray Nadeem to run their course, so he could manipulate the FBI into letting him out of prison.
- The Bohrok swarms of BIONICLE. Before their introduction, Makuta had just been defeated by the heroes and disappears. Shortly after their story arc was finally wrapped up with the defeat of the Bohrok-Kal, Makuta returns to the spotlight. Although it was later confirmed via Retcon that Makuta was responsible for awakening the Bohrok, he did so to distract the Toa and thus buy himself some time to recover from his previous loss, thus directly invoking this trope.
- Vaati from The Legend of Zelda: Four Swords and The Legend of Zelda: The Minish Cap, who serves as the Big Bad in those games. Said games take place between Demise's defeat in The Legend of Zelda: Skyward Sword and his reincarnation/successor Ganon's emergence in The Legend of Zelda: Ocarina of Time.
- Osmund Saddler from Resident Evil 4, who unlike other villains in the series does not have any connection to Umbrella. Albert Wesker returns as the Big Bad for Resident Evil 5.
- The first Mario & Luigi game, Mario & Luigi: Superstar Saga, dealt with Cackletta. The third one, Mario & Luigi: Bowser's Inside Story, dealt with Cackletta's Ascended Dragon, Fawful. The second one dealt with... the Shroobs?
- Subverted if you take into account the other Mario Role Playing Games. Fawful has only been the villain in two out of nine games.
- Castlevania: Lords of Shadow: In the first game Satan is the Big Bad and the true manipulator behind all of the events. By the end of the game, The Hero Gabriel Belmont becomes Dracula and serves as the interim villain of Mirror Of Fate. In Castlevania: Lords of Shadow 2, Dracula performs HeelFace Turn, and Satan returns as the main villain.
- Injustice: Gods Among Us had Superman from the Injustice Earth as the Big Bad, while its sequel has Brainiac. The tie-comic that bridges the gap between the two games has Ra's Al Ghul and the League of Assassins as primary antagonists.
- Daemon served as the Big Bad for the final season of ReBoot until she was defeated, and Megabyte returned from being banished to the Web at the end of the previous season.
- In the animated Teen Titans series, Slade was the Big Bad for the first two seasons, until his death by the end of the second. Brother Blood takes over as the Big Bad for the third season, but he works like an Arc Villain and a Filler Villain (not a single mentioning or appearance other than his four episodes), so how is he included here? The H.I.V.E organization was already in existence in prior seasons, Slade himself returned in full on the fourth season, and Blood's defeat led to the H.I.V.E. Five striking out on their own as an independent team.
- In Winx Club, the Trix are the main villains in the first season, and they're still major villains in seasons 2 and 3. They're absent in season 4, and the Wizards of the Black Circle take over their role as the primary enemies of the Winx. After they're beaten, the Trix make a return in season 5.