'Hawaii Five-0' Sneak Peek: McGarrett and Catherine Have a Spicy Reunion (Exclusive)

Michelle Borth returns as McGarrett's ex on Friday's episode and ET has the exclusive first look.

Steve McGarrett and Catherine Rollins: reunited again!

Michelle Borth is back as McGarrett's ex on Friday's episode of Hawaii Five-0, titled "Kind Is the Bird of Kaiona," returning to the fold with a dangerous new mission for the Five-0 force. Catherine recruits McGarrett and the team to help track down a uranium deposit thought to be hidden on an abandoned Hawaiian island before a suspected terrorist can make dirty bombs with it.

In ET's exclusive sneak peek, Catherine fills McGarrett and Lou in on the task at hand, but the boys are a little too distracted by her presence to focus. 

"Are you guys OK?" Catherine abruptly asks in the middle of her download, just as Lou and McGarrett attempt to stealthily have their own secret conversation behind her back.

"Yeah, why?" McGarrett replies, pretending like nothing's amiss.

"Because you're being weird," Catherine calls them out.

Later, McGarrett asks Catherine the one question at the top of his mind: Why come to Five-0 when she has "unlimited amounts of CIA assets" at her disposal? That's when Catherine reveals the real reason she went to McGarrett.

"Steve, this is your island. No one knows it better than you -- and I figured if there are terrorists operating on it, that you'd want the opp," she hard-sells, with Lou warning McGarrett in the background not to fall for her trap. "And besides, I thought it'd be nice to catch up..." Are they due for a reconciliation? Watch the exclusive sneak peek above.

Last month, Alex O'Loughlin spoke to ET about reuniting with Borth for Friday's episode, which offered an opportunity for the pair to address the state of their relationship.  

"It was great to see Michelle and it was cool to pick up where we left off. It's a great action, travel-y episode with McGarrett and Catherine," O'Loughlin told ET in March. "It's also nice to see these two sharing the same space for a minute and to explore how they feel about each other, how everything is cool [between them]. It was weird for a minute, the way she left -- somebody who's about to get proposed to and they choose an allegiance to the government and national security. It was a big blow for McGarrett. I think this episode served as a gentle closure and reinstated the friendship between the two of them, which was really important."

Hawaii Five-0 airs Fridays at 9 p.m. ET/PT on CBS.

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