Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Where does Superman returns to? Movie plot title: Superman Returns Movie plot: For five years, Superman (Brandon Routh) has abandoned his adopted home of Earth while on a journey to visit the remains of Krypton. His seemingly selfish decision has ruined his image in the eyes of many, including journalist Lois Lane (Kate Bosworth), who writes a scathing article claiming that the world "doesn't need Superman". Billionaire Lex Luthor (Kevin Spacey), who lost his fame and fortune after being exposed as a criminal by Superman, secures an early release from prison and marries an old heiress, whose subsequent death makes him wealthy once again. Upon returning to Metropolis, Superman, in his human identity of Clark Kent, is shocked to discover the consequences of his disappearance. While covering the launch of a space shuttle, he narrowly saves a plane carrying Lois and other observers from crashing after a mysterious power failure, an act that earns him much goodwill. Unbeknownst to anyone, the accident was triggered by Luthor using Kryptonian technology stolen from the Fortress of Solitude. Clark tries to fix his relationship with Lois, but soon learns that she is engaged to Richard White (James Marsden), nephew of Daily Planet editor-in-chief Perry White (Frank Langella), with whom she shares a young, asthmatic son, Jason (Tristan Lake Leabu). Luthor has his aide Kitty (Parker Posey) distract Superman, allowing Lex to steal a sample of kryptonite from a museum. Suspecting his involvement, Lois requests an off-the-record interview aboard his private yacht. Luthor admits that he is indeed responsible and reveals his true plan: to create a new continent modeled after Krypton that he can shape in his image, while triggering massive tsunamis that will wipe out the nations of the world and force humanity to turn to him for survival. Jason has an asthmatic attack when Luthor reveals the kryptonite, but has no subsequent reaction when Luthor holds the stone near him. The Fortress of Solitude as depicted in the film. When one of Luthor's henchmen threatens Lois, Jason crushes him with a piano....
The answer to this question is:
Metropolis