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"So," Chekov clapped his hands in eagerness, "who's the problem?" When Riker pointed down at the deck, he blinked and said, "Oh, there he is." He knelt down and rolled the still-senseless Bester over, checking him for weapons. "Rather a handsome devil, isn't he?"

"We hadn't noticed," Worf growled.
Pavel Chekov taking Alfred Bester into custody, during the Undocumented Features story "A Day of Infamy".

Let's say you're a fanfic writer. Let's make another assumption and say that you like a particular actor and everything they've ever been in, because they were in it.

It's entirely possible that you may write a Doppelganger Crossover, a story in which two characters played by the same actor meet each other. Or that they are each other. In other words, a crossover which is only happening because the two sources share an actor.

You may desperately want Riker to meet Xanatos, or Ranma One Half to be a reincarnation of Inuyasha, or you might just want to see what happens when John Crichton takes the place of Cameron Mitchell, and don't even start on what would happen if Han Solo bumped into Henry Jones Jr.. The end result, however is the same. A Doppelganger Crossover.

On occasion, this can be one part of a Massive Multiplayer Crossover. Compare I Want You to Meet An Old Friend of Mine.

Examples of Doppelganger Crossover include:
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