Crossover

A crossover is where aspects of two or more distinct fictional universes are included within the same story.

Crossovers
"Its Hour Come Round at Last" featured a crossover between Star Trek and.

"A Thunder to Shake the Stars" is a crossover between Star Trek and

Episode 3 of Star Trek: Brave New Worlds involved a crossover with Star Trek: Pretoria.

Star Trek: Unity is a crossover that saw several separate fan fiction series combine to deal with the Vendoth.

The fan fiction Star Trek: Voyager - Dark Realm included crossovers with and.