I thought we should establish
a CHAIN of command.
The Big Bang Theory Season 5, Episode 1
the Citadel to give him back his CHAIN.
Game of Thrones Season 3, Episode 7
Uh, did you notice your key CHAIN?
The Big Bang Theory Season 10, Episode 7
specifically a local CHAIN.
Breaking Bad Season 4, Episode 7
It's on the Batman flash drive
on your key CHAIN.
The Big Bang Theory Season 11, Episode 9