The Smurfs and the Magic Flute 1976

Using IMDb advanced search, filtering only by English language.

Notable entries missing include:
Monty Python and the Holy Grail (1975)
The Omen (1976)
Damien: The Omen II (1978)
Willy Wonka & the Chocolate Factory (1971)
The Lord of the Rings (1978)

https://en.wikipedia.org/wiki/Film_series
https://www.filmsite.org/series-boxoffice.html

My movie collection.

The complete list of films

I put all the unlisted movies from my collection in here. This list contains a lot of older movies. Movies I simply don't remember very well or just so-so movies.

Cartoon series and movies I watched as kid