"Superman Returns" director Bryan Singer told Sci-Fi Wire that he had to cut a lengthy early sequence from the film in which Clark Kent/Superman (Brandon Routh) flies in a crystal ship to the fragments of his home world, Krypton. Glimpses of the scene can be seen in the early trailers and in artwork that has gone online like below.

"I shot a whole [scene] with the [return-to-Krypton] sequence, I cut a [version of the] film that was about two hours and 45 minutes ... that I showed to friends and family. And watching with a group of people, we're watching the movie unfold, I felt that ... it was really interesting on its own and could deserve a life. [But] somewhere else" said Singer in an interview on June 9th in Los Angeles.
The final cut of the film runs less than two and a half hours. Singer hopes the return-to-Krypton sequence will eventually see the light of day in some form - "On DVD. Or, maybe, I think it should be on 3-D IMAX. ... It's very elegant, but, ... in the context of this movie--where this movie needed to be and what it needed to be about--I didn't feel it" he added.
