Crossovers in video games occur when otherwise separated fictional characters , stories , settings , universes or media in a video game meet and interact with each other. These may exist as a gimmick if two separate games in question are developed by the same company. Otherwise, they may exist as a gag from a rival company. The following is a list of games in which crossovers appear in either the form of a cameo of any kind, a guest character , or the theme of " crossover " in general in a video game itself.
In the End Times the iron fortress shall be cast down. Its walls breached and its Gate forced open. Those that dwell beyond shall spill through it. The air shall burn and the ground shall melt, the Daemon shall lie down with the machine, brother shall slay brother with fire and sword. And the sky-wound shall pour its malice forth.