[Salaryman Zero]

I'm gonna throw in my vote just to keep this moving but yeah, much as I enjoyed the Guts two-parter (which features the first use of the recurring Ultraman gets crucified! trope), Dada for all his incompetent mishaps, is simply the more iconic baddie.

So Dada takes it with 5-0! Moving on...

R5: Dark Mephisto vs. Red King