Crossover

A crossover is a story where characters of two or more different franchises meet together in a shared universe setting. In fanfiction, this may include stories with characters from two different authors in two different story universes.

The policy for crossovers on the Smurfs Fanon Wiki is that the authors of the two separate fanfiction series must be in agreement as to which characters they want to do a crossover story with and what is allowed to happen in the story so that it does not interfere with any ongoing story threads that either of the authors have going in their own series.