This was supposed to be a 3 film arc

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Archived from the IMDb Discussion Forums — Superman Returns

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neoyamaneko-86579 — 9 years ago(February 08, 2017 12:59 AM)

Frank Langella mentions in an interview that he was signed on to do three Superman movies.

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Blue Wave — 4 years ago(September 25, 2021 02:38 AM)

I can see a plot line for one more in this series easily - it involved the shuttle going to Mars, and thus J'on J'onzz is brought in. Brainiac is introduced as the films' villain, and this is used as a way to bring Supergirl in the film series as well - there is even a trick involving a post-credits in this film involving Hal Jordan that would lead to the Green Lantern as well.