
You need to push your brain out of its
comfort ZONE and reach mental exhaustion.
The Big Bang Theory Season 10, Episode 22

Not really. I was in my boogie ZONE.
The Big Bang Theory Season 3, Episode 14

Or, as we call it here,
"the ZONE ZONE."
The Big Bang Theory Season 12, Episode 14

Bow, General Zod trapped
in the Phantom Zone...
The Big Bang Theory Season 3, Episode 13

No, no, no, no.
The ZONE ZONE is a safe ZONE.
The Big Bang Theory Season 12, Episode 14