About to dive into 'Knock Knock' on any device? Here’s where you can watch it, including streaming and cable services with rental, purchase, and subscription options, so you can find the right fit.

'Knock Knock' tells the story of down-on-his-luck former boxer Sam Grant, who one night finds himself caught in a whirlwind of conjecture and conundrum as his colorful and quirky neighbors come to him ...