Honestly, there needs to be a tv series that is nothing but oneshots that feature two different franchises owned by different companies crossing over. Both of the companies plus the one that produces it should make a killing. I am picturing Futurama meets LSH, Star Trek meets Doctor Who, Invincible meets The Simpsons....
If you can convince both companies that it would benefit them, it would happen. Money (and/or Power) is the great motivator. How to convince them of that .... sorry, no clue.