https://en.wikipedia.org/wiki/Prequel
https://en.wikipedia.org/wiki/Sequel
https://en.wikipedia.org/wiki/Category:Interquels
Also
https://en.wikipedia.org/wiki/Sequel
https://en.wikipedia.org/wiki/Category:Interquels
Also
- paraquel - a story that takes place simultaneously with a certain other story
- circumquel - a story that takes place partly before, partly after a certain other story
- inquel - a story that takes place during a gap in some other story's narrative
Source