He's taking a turn to the DARK side.
The Big Bang Theory Season 4, Episode 9
S-So you're even better
than DARK matter.
The Big Bang Theory Season 11, Episode 10
The Dark Knight
has your back.
The Big Bang Theory Season 5, Episode 11
I walked in the DARK
for so long.
Westworld Season 3, Episode 8
For the night is DARK and full of terrors.
Game of Thrones Season 3, Episode 5