Episode 4 of Hawaii Five-O will show the team investigating the murder of a wedding crasher and Danny Williams (Scott Caan) will make an important decision regarding his relationship with Gabby.

In A ia la aku, the prime suspect in the murder is be the runaway bride. The episode will also deal with Kono facing a new threat as she investigates a crucial case in Hong Kong.

The preview starts with a wedding as the bride walks down the aisle, but things turn awry as she turns around looking flustered.

"The bride bailed on the ceremony," Chin Ho Kelly (Daniel Dae Kim) tells the team, to which Danny responds by saying, "Oh, at least we are dealing with a smart woman."

Danny later discovers that she did not just run away because she got cold feet.

The clip is interspersed with Danny's wisecracks about the disadvantages of getting married. Viewers see the bride, still in her wedding gown, crying with the mascara bleeding down her face as she drives rashly into the night. She eventually ends up in a car crash. Toward the end of the clip we see her in her upturned car, injured and barely alive.

Though Danny reunited with Gabby (Autumn Reeser) at the end of season 3, the couple might have to face challenges as they rekindle their romance. Earlier reports suggested that Danny's daughter, Grace, might cause problems between the couple. TV Guide revealed that it could come down to Gabby being forced to choose between Danny and a job.

Another clip for episode 4 features Chin and Kono in a tense situation. Kono calls Chin from an undisclosed location and says she got a lead on the shooting from one of the associates. A bound and gagged prisoner can be seen in the background.

Kono informs Chin that they got some information out of the man that could be useful to their case. She also reveals that she has found out that the perpetrators don't just want Adam dead but want to get rid of her too. Chin then suggests that she needs to get out of Hong Kong right away.

Another teaser shows Steve McGarrett and Danny out on a double movie date with their girlfriends. The clip is comical as the two try to debate the nature of the movie they are watching and Steve doesn't quite get why a romantic-comedy would have sad bits in it. Danny explains the concept of a third act to him, suggesting that it is a device used by the filmmaker to leave the viewer feeling all "warm and fuzzy."

Episode 4 airs on Friday, Oct. 18 at 9 p.m. E.T on CBS.

Watch the teasers here:

Watch the clip featuring Danny and Steve in the theater:

Watch the third clip featuring Chin and Kono:

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Hawaii Five-O