The crossover is a staple of science fiction fandom: it's the only way to answer age-old questions like, "The Enterprise or the Millennium Falcon?" There have even been canon crossovers, some of which have gone well and some of which...didn't.
By their very nature, the options for crossovers and fusions are endless. Here are ones that never made it to screen or page, but did make fantastic art.
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Top image: Downtime in Spacetime by Either-Art at deviantART
