Hawaii Five-0: Watch Season 4 Episode 15 Online

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Welcome to the Hawaii Five-0 family, Mrs. Danno.

Veteran actress Melani Griffith guest-starred in this key role on Hawaii Season 4 Episode 15, as we once again delved into the past of a key character.

That has been a major theme of the series over the past few weeks and we've been loving it.

What did Danno's mom have to do and say? What about the case of the week? How did Lou fit into it all?

All very good questions. All of which will be answered when you watch Hawaii Five-0 online at TV Fanatic:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.