Subtrope of Numbered Sequels. Basically, this happens when the numbering of sequels gets really complicated. This often occurs when Sequels and Interquels start filling up the chronology, but can also happen when a sequel has an odd name that doesn't include the number. This may be why they Stopped Numbering Sequels.
- The Rambo series goes First Blood, Rambo: First Blood Part II, Rambo III, John Rambo.
- Doctor Who has reset its numbering twice, the second one quickly forgotten about. Hence why the 2010 series is known as "Series 1/5/31". Steven Moffat gave the joke name "Fnarg" to the series for this very reason. The Five Doctors, the TV movie, and the Specials are considered interquels, with the first and the last of them appended to the end of the series previous. It's on course to happen again, with the split in the 2011 series flip-flopping between "Series 6", "Series 6a/6b", and "Series 6/7"
- Windows 7. In the software numbering, it's 6.1. Going on major design changes, it is the seventh iteration (NT/95/98/2000/ME being the fourth, XP being the fifth, Vista being the sixth). But as far as major releases go, it's the ninth (NT/95, 98, 2000/ME, etc).
- Discussed in the Angry Video Game Nerd's video "Chronologically Confused about Movie and Video Game Sequels"
- Silent Hill had four games, a prequel (Zero), an oddly named sequel (Homecoming), and a remake of the first (Shattered Memories). The next, Downpour, was slated to be released as 8 until someone realised the problem.
- Super Metroid and Metroid Fusion had the titles "Metroid 3" and "Metroid 4" in their opening titles. Metroid Prime came out the same time as Fusion, and was intended to be just an aside between the original and Return of Samus. But then the Prime series was a runaway success, and then Metroid: Other M, an interquel between Super and Fusion, came out in 2010. This may prompt Nintendo to drop the classic system of numbering if the 2D sequel to Fusion ever comes out.
- Street Fighter, which was released in the order I-II-Alpha-III-IV. Chronologically, it's I-Alpha-II-IV-III.
- Final Fantasy IV was originally released in America as II, and VI as III'. Synchronising the sequels as of VII confused Americans briefly, but the numbering has caught on.
Hello, Unknown Troper. You'll need to get known to lend a hand here.