with an UNKNOWN virus!
Money Heist Season 3, Episode 4
It's just the UNKNOWN thieves
we need to worry about now.
Game of Thrones Season 2, Episode 8
whose UNKNOWN provenance
jeopardizes
The Big Bang Theory Season 5, Episode 2
...between the UNKNOWN...
Westworld Season 2, Episode 6
I'm not comfortable
bringing in UNKNOWN entities
into our operation.
Breaking Bad Season 2, Episode 5