Danny (Scott Caan), private investigator Tony Archer (guest star James Caan) and McGarrett (Alex O'Loughlin) cross paths as they investigate the death of a famous talk radio DJ. In the episode "Lekio" on "Hawaii Five-O" airing 2/27/12
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James Caan joins his son here on the Hawaii Five-0 episode "Lekio."
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Hawaii Five-0 Season 2 Episode 18 Quotes

Kono, this is not a good time, your interrupting vehicular manslaughter.

Danny

Grace: He's the funniest boy in school
Danny: I'm sure he's a regular Chris Rock.
Grace: Who?