Five-0 tries to figure out who killed an officer who was working undercover for the ATF, while also babysitting for McGarrett's sister Mary's new baby.



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Episode cast overview, first billed only:
Kono Kalakaua (credit only)
Max Bergman
Catherine Rollins
Cherie Tranton
Jason Decker (as Alvin Joiner)
ATF Special Agent Blake Kennedy
Hideaki Kuroda
Allison Hutchins
Mary Ann McGarrett
Lou Grover
Charlie Fong
Linda Davies


A surfer is stabbed so Steve goes to investigate. Chin says he knows the guy; he's a guy who tried to be a cop but was kicked out of the police academy for an infraction. But an ATF man shows claiming that he's one of his agents. That getting kicked out of the academy is part of his cover. He was working on a gun dealer. So they wonder if the dealer found out who he is but the dealer appears to have no idea he was an agent. They learn that someone has been ripping off the dealer and it appears they were operating with information that the agent was providing the ATF which leads Danny to suspect he was dirty. Steve tries to keep an open mind. Steve's sister shows up and has a baby. And when she gets sick she asks Steve to take care of her which makes working the case tough. Catherine continues to try and find Adam. Written by

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Action | Crime | Drama


TV-14 | See all certifications »




Release Date:

8 November 2013 (USA)  »

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Aspect Ratio:

16:9 HD
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Did You Know?


When Steve, Danny, and Chin take care of the baby. Their actions are reminiscent of the film, 'Three Men and a Baby'(1987). See more »


While outside the condo, Chin, Steve, and Danny (holding he baby) are all standing in sunlight when Steve tells Danny to put a sun hat on the baby. When the camera shifts, Danny still holding the baby is in the shade. See more »


Steve McGarrett: [Steve walks into the HQ with Mary's baby attached to his chest]
Danny Williams: [laughs hysterically]
Steve McGarrett: [smiling] Is this funny to you?
Danny Williams: [laughing] Yeah!
Steve McGarrett: So when you're through amusing yourself, I need you to wipe down her changing pad please.
Danny Williams: No, no, no, I'm retired, you see. And it's going to be way too entertaining to see Uncle Steve on diaper duty so go ahead.
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Heart Beats
Performed by Johnnyswim
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User Reviews

Mary, Grover, Undercover ATF Agent! More Chin!
12 November 2013 | by (Seymour Tennessee) – See all my reviews

All rolled up into one episode. As we see that a cop who was suppose to be suspended or kicked off due to his bad attitude was really an undercover ATF agent that was part of the plan. Really nice to see inter agency cooperation that is lacking in a lot of shows these days. No matter what agencies are fighting.

As Mary is back! And she has adopted a baby, much to the surprise of Steve. As she can't get her own life in order. And adopt a baby but she gets sick and it becomes "Three Men and a Baby" episode. Remember early on when Steve was not good with kids? Well he must had gotten that from Danny. As he has gotten much better.

Also Grover is back. As really think I am really liking the guy and really putting Steve in his place. As he won't ever pay for his arrogance meaning Steve or the breaking the rules. Grover is right, Steve is NOT a cop. A REAL COP! Chin may not like to have heard that. But sometimes the right answer is not always the most popular.

Speaking of Chin, really glad to see more of him in wake of Grace Park having her baby's absence. Keep up more Chin!

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