
He's taking a turn to the DARK side.
The Big Bang Theory Season 4, Episode 9

His eyes also light up in the DARK.
(LAUGHS)
The Big Bang Theory Season 10, Episode 9

It's-it's like finding
DARK matter,
The Big Bang Theory Season 11, Episode 10

Someone once told me
the night is DARK and full of terrors.
Game of Thrones Season 2, Episode 4

Speaking of new careers,
how are things going with DARK matter?
The Big Bang Theory Season 8, Episode 6