Works that cross over into other fictional universes. Ordered by medium and format, then alphabetically.
Golden Age Film; Short Film (Crossover)
Teens. An extra credit project for a school class. Surprisingly well-produced for the age group and content. Kirk and Spock meet Han Solo and talk about galactic geography.
Golden Age Film; Long Film (Crossover)
Batman. Claims to have been "named one of the top five Fanfilms of all time by Fan Cinema Today."
Golden Age Animation; Series (Crossover)
Golden Age Animation; Short Film (Crossover)
Alien. The original Star Trek crew faces down Alien in this unusually-animated (and incompleted) "motion comic."
Silver Age Mashup/Recut; Short Film (Crossover)
Star Wars. By TheGreatLink. Recut from TNG and Star Wars original trilogy footage. Tries to be funny as well.