A trailer for a new Superman movie has been released, featuring the return of the Man of Steel and introducing a superdog named Krypto. The movie, which is part of James Gunn's DC Universe, appears to include other characters such as Lois Lane, Lex Luthor, and possibly Green Lantern or Guy Gardner. The trailer shows Krypto helping and possibly hindering the Man of Steel, with some outlets suggesting a complicated relationship between the two.