Season 1 - 12 times

 Nikita
Michael: Everyone abort! Get your teams off the perimeter now!

Charity
Michael: You don't have to like the job. You just have to do it. I'll be at the party tomorrow night. His perimeter security is very tight. We'll have to work from the inside. You'll be briefed in the morning.

Gray
Michael: No sign of Benko at the perimeter.

Gambit
Operations: Close off the perimeter. Nothing goes in or out.

Operative: Team leader, check. Perimeter sealed.

 Noise
Michael: Keep a visual. We won't take him until he leaves the bar. Perimeter teams are in place.

Michael: Two more crates. Alert the perimeter teams we'll be coming out.

War
Operations: Put the perimeter's troops fire at full bank.

Missing
Birkoff: He's inside the perimeter.

  Verdict
Birkoff: Perimeter's quiet too.

Operations: Secure the perimeter.

Mercy
Michael: Perimeter teams-converge. Tyler's coming up the north stairwell now. Any new intell, Birkoff?


Season 2 - 10 times

 Third Person
Michael: I will need to be inside the perimeter.

Mandatory Refusal
Birkoff: Perimeter team A, any sight of our target?

Soul Sacrifice
Michael: Team 2, tighten the perimeter. What about the hostages?

Double Date
Clayman: We've cleared the perimeter.

 Old Habits
Michael: We've got Halaire. Perimeter status.

Nikita: Perimeter's clear.

 Off Profile
Michael:They couldn't. The perimeter wasn't secured.

Andrea: Team 1 will secure the perimeter. You, Michael, and I will work the inside.

Andrea: Begun the sequence. Perimeter team, take your position.

  Adrian's Garden
Birkoff: Send containment in now. Lock up the perimeter. Make sure every circuit is recording.


Season 3 - 12 times

Gates Of Hell
Nikita: Okay Birkoff, there's two on the perimeter. How many inside?

Michael: Not unless the zone is dirty. Scan until we've crossed the perimeter.

Cat And Mouse
Operations: There was no resistance around the perimeter?

Birkoff: I don't see any around the perimeter.

Under The Influence
Michael: How wide is the perimeter?

 Outside The Box
  Operations: We've located the cicle. The target is on the second floor. Michael's team has secured the perimeter. Nikita, you'll stay with Kruger; guide him to the target.

 Beyond The Pale
Birkoff: They're within the perimeter now.

 Third Party Ripoff
Davenport: Team one will do advance. Take out light security and prep for incoming. Teams two and three will implement the profile. Twelve minute check, everyone is divided into perimeter and backup. We're out in ten. Let's go. Michael, I didn't want to say this in front of the team...

Michael: Davenport, hold. Velden's team's still outside your perimeter.

 Playing With Fire
  Birkoff: Makes sense... the entire perimeter's a hot zone. And Crimson Storm has satellite tracking capabilities.

Three Eyed Turtle
Greg: No problem. Blue team, I need you split. Three in the east, one in the hole, two stay in the perimeter.

Michael: When you get to the perimeter, go silent. Retrieve Brulois. Nikita and Hillinger will set the charge.


Season 4 - 15 times

 Getting Out Of Reverse
Michael: Perimeter teams, hold your positions. Nikita, hostiles still in place.

Gelman: Sorry I’m late. I was just making sure the perimeter was clean.

There Are No Missions
Madeline: Keep it open as long as you can. I want six teams out. Nikita on point. Birkoff has location. Put another six teams on standby in case the perimeter widens.

Dori: Look, it has to be. The building perimeter ends here. I found a way out, Birkoff.

  Time To Be Heroes
Michael: Preliminary intel indicates Crystal Sky's base of operations to be within this perimeter.

Michael: Birkoff, do a perimeter sweep.

Birkoff: I have you entering the target zone. Perimeter is clean.

  Hell Hath No Fury
Birkoff: None. Perimeter is clean.

 Kiss The Past Goodbye
Hayes: Perimeter is clear. Exit points secure.

Line In The Sand
Birkoff: I have Michael combing the perimeter. He’ll find them.

Birkoff: Tell then to hold their position until I sweep the perimeter.

Birkoff: What channel is he on? Comm command online. Perimeter looks good. Davenport...

 Abort, Fail, Retry, Terminate
Birkoff: First team we have you on the board. Perimeter is clear.

 Time Out Of Mind
Michael: Proceed. Perimeter is neutralized.

 Face In The Mirror
Operations: How is that possible? Nikita's numbers are the highest they've ever been. And we had teams blanketing the perimeter.


Season 5 - 4 times

Deja Vu All Over Again
V.O.: The perimeter's been penetrated.

 The Man Behind The Curtain
O'Brien: Set up defensive perimeter.

Quinn: We’ll intercept on the perimeter. The configuration will be staggered. Further details are on your panels.

Graff: Well, how did he get past the perimeter?