One of the tennis balls
came off his WALKER
The Big Bang Theory Season 7, Episode 14
I killed a White Walker, I killed a Thenn.
Game of Thrones Season 5, Episode 7
But no one's killed
a White Walker in thousands of years.
Game of Thrones Season 3, Episode 10
Killed a White Walker, eh?
Game of Thrones Season 5, Episode 7
He killed a White Walker.
Game of Thrones Season 6, Episode 6