xkcd #3324: Ultimate Movie Series
Title text:
Sadly, none of the 14 Land Before Time films manage to make the list, although a small but devoted fan contingent argues that The Great Longneck Migration should beat out Guardians of the Galaxy.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3324/


This list isn’t picking only one film from each franchise. It’s picking the highest rated nth film from all franchises that have at least n movies. So the franchise with the highest rated 8th film is Star Trek, with First Contact. And the franchise with the highest rated 11th film is also Star Trek, with the 2009 reboot.