Hawaii Five-0: Watch Season 4 Episode 21 Online

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We're inching ever closer to the Hawaii Five-0 Season 4 finale.

On the penultimate installment, McGarrett and Catherine headed to Afghanistan to stop the Taliban from harming a boy with a connection to the latter:

His family saved Catherine's life years earlier.

So, yes, it was an especially personal and intense hour of this CBS hit. And you can relive it right now when you watch Hawaii Five-0 online:

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