A trailer for the movie "Avengers: Doomsday" has been released, featuring the return of several characters, including the X-Men and Captain America. The trailer reportedly shows a battle between Doctor Doom and the combined forces of the Avengers and X-Men, with various Marvel stars making appearances. The trailer's contents are being widely discussed, with some outlets noting the return of specific actors, including Robert Downey Jr. and Chris Evans, as well as Star Trek actors Patrick Stewart and Rebecca Romijn.