'Superman' features a pocket universe, a tyrannical billionaire, and a flying dog. Confused? Here's the ending explained

Superman talks to Krypto the Superdog in "Superman." Warner Bros. Pictures The director James Gunn's new "Superman" movie leans hard into its comic book origins. The story sees Superman go up against the villainous billionaire Lex Luthor. It's a busy plot, so here's the ending of "Superman"…