First their are the seven "Superman; man of steel" movie's.. with exactly 5 Chapter one's, no more, certainly no less..

Then ...

Superman 2: the age of Krypton .. in 5 Volumes (movies)..

Superman III.. an infinite number of Hofstadterian BASIC-computer lang. and Fortran.. sequels all with the name .. Superman III.. directed by Ridal Scott and Sophia Copolla..

.. finally Superman IV: the quest for peace.. pure ada and Lady Lovelace, man .. pure ada.. and May Welland..

Superman 5; apocalips, directed by Sophia Copolla

Superman 6; Amazonia, directed by Geoffrey Wright or Lars Van Tiers or both directors co-directing this movie..

Superman 7; the Daily Planet, directed by Robert Altman

Superamn 8; the Daily Star, directed by Sidney Lumet

.... then perhaps a Superman 9 of an undisclosed title..

.. then finally ...

The Sequals with a capital "S" and THIS TIME.. sorry for capitalizations.. Sequals spelt with an "a" instead of with an "e"

The Sequals are...

Superman; man of steel 2; Metropolis

Superman; man of steel 3; Smallville.. the Dini / Benitez Poison ivy Pamela Isley movie for the decades...

finally.. the apocalypse...

Superman; man of steel 4; Krypton...

.... the age of Krypton is over...
Krypton has arrived..

General Zod brings.. Buster Keaton, Charlie Chaplin is Fyenshya (Winona Horowitz Ryder) in disguise with an amiable, lovable black mustache.. Modern Times and Woody Allen.. Krypton is here...

     Ralph Fiennes

Winona Ryder

           Victoria Hill

Michael Rosenbaum

             and

Brandon Routh

Superman; man of steel 4; Krypton..

..... directed by Steven Spielberg and Sophia Copolla....