G. Callen career is an experienced NCIS agent whose penchant for undercover work is legendary. Fittingly, he was introduced during the NCIS episode "Legend."

His assignments have included stints in Serbia and Russia. Callen is described as 'a chameleon who transforms himself into whomever he needs to be to infiltrate the criminal underworld'

Twice, over the course of his career, Cullen's life was saved by Leroy Jethro Gibbs, once in Serbia and once in Russia.

Cullen is played on NCIS: Los Angeles by Chris O'Donnell.

G. Callen Quotes

(Hetty approaches Callen as he is sleeping, he wakes up staring at Hetty)
Hetty: Did you catch him this time? You were twitching like a sleeping dog.
Callen: Well, you now what they say about sleeping dogs. (looks at Hetty)

Sam: Why would you rob a bank if you already had millions of dollars?
G: It's gotta be something bigger than that.

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NCIS: Los Angeles Quotes

You're not upset because I betrayed you. You're upset because you didn't figure it out.

Joelle [to Callen]

Joelle: And that's your family?
Callen: Yeah and I want you to meet them.
Joelle: I can't meet them Callen. Not until I meet you.
Callen: Okay. What do you want to know about me?
Joelle: Hmm, well. How bout we start with your first name
Callen: That's a little bit complicated.