Welcome to the 30 day challenge of May, which sees a return to two of the most iconic things in pop culture, to say nothing of Science Fiction, namely Star Trek and Star Wars. Throughout this month some prompts will be general and apply to both franchises, while others will be Trek/Wars specific, as indicated.

Franchises as gargantuan as Star Wars and Star Trek are no strangers to the concept of the Crossover. Both in the sense of letting your characters pop up in wholly separate media franchises for a lark, or of major characters from one TV series popping up to say hello to the cast of another.

So, what are your favorite Star Wars and Trek crossovers – both with other franchises, or between sub-series within Wars and Trek? What are the most risible?

Bonus prompt: What in-franchise crossovers felt too indulgent or nonsensical?

Extra Bonus prompt: Who are in-franchise characters you’d like to see meet up, but hasn’t?

Kelvin Legends prompt: What are fun other franchises Trek/Wars could be mashed up with?Legends of Kelvin Prompt: What should a Wars/Trek crossover be like?