Hawaii Five-0 is calling all cars. There's a serial killer on the loose, and it will take ever expert McGarrett can rustle up if Five-0 wants to emerge from season 7 victorious.

Gabriel (Christopher Sean) is gone, but a new threat will plague Oahu in his wake. A spat of murders will introduce Five-0 to a host of recurring characters, including the recently announced Dr. Margaret Gray (obviously of no relation to television's other Dr. Grey).

Played by Elisabeth Röhm, Entertainment Weekly believes the police psychologist might be on hand to help solve one of the series' toughest cases. Gray will by no means be alone in this quest; along with Five-0, Claire Forlani's Alicia Brown will also join the hunt. Although retired, the criminal profiler will be brought back into the crime fighting game early in the season.

"Alicia and McGarrett have a profound respect for each other and what they have accomplished professionally," executive producer Peter Lenkov told Entertainment Weekly. "Her insight and expertise as a profiler will be paramount for Five-0 to track down this killer menacing the Island for those who visit and those who call it their home."

The island's Ted Bundy won't be the only head scratcher plaguing our heroes this fall. For starters, Chin (Daniel Dae Kim) will need to figure out what to do with his orphaned niece. Will he choose to become her adoptive father, or will her family in Mexico step up to the plate? Meanwhile, McGarrett (Alex O'Loughlin) will have to puzzle out Dae Won (Sung Kang)'s motives. Wo Fat's father made his debut in the season 6 finale, and it's clear he didn't share his true intentions with the former Navy SEAL.

Find out more when Hawaii Five-0 returns to CBS this fall. Click the video below to get a sneak peek at the Sept. 23 premiere.

 #H50 701 - ohana

A video posted by plenkov (@plenkov) on Aug 3, 2016 at 2:05pm PDT