It is revealed in this episode that Birkhoff's birth name is Lionel Peller.
Birkhoff: You want to promise me something? Promise me you'll take your own advice. Stop running. What you run from you run into.
Nikita: You never cease to amaze me, Nerd.
Crawford: Everything's a conspiracy with you, isn't it? Should I have my DNA tested too? You're the only fake in this room, princess. I'm going to ask you one more time. Who are you?
Alex: My father was gunned down in front of me when I was 13 years old. I was sold into slavery, but I lived. I came out a drug addict, but I got clean. I've killed dangerous men, and I've watched people I love die in my arms. You want to know what I am? I'm a survivor.
"Let It Pour" by Cancer Bats