There's nothing 'on television' right now. [=there are no programs that I would like to watch now]
I recognize your face. Are you 'on television'? [=do you appear in a television program?]
What is 'on the television' [='on TV', ('chiefly Brit') 'on (the) telly'] tonight?
(..) and I thought about how rare it is to really get in the groove like that. How, most days, I can't concentrate because my idiot child is blasting the television, and it suddenly dawned on me; hot cock on a rock, she never even picked up the little noise and snot factory! (..)2018 TvShow: BoJack Horseman Title: Free Churro Season: 5 Episode 6