https://www.metv.com/stories/this-man-was-the-original-mork-from-ork-but-walked-away-from-the-role

We can probably thank John Byner (https://outsider.com/news/entertainment/happy-days-almost-cast-different-actor-mork-why-robin-williams-got-part/) for the career of Robin Williams.

i just assumed Robin Williams originated the character. Wow. thansk for posting