Hawaii Five-0 will be back to fending of terrorists during "Pe'epe'e Kānaka (Those Among Us)."

The CBS drama is taking a week off, but Five-0 will have their hands full when it returns on April 25.

An investigation into a deceased pool cleaner will take a drastic turn when Steve McGarrett (Alex O'Loughlin) and his team uncover ties to a possible group of radical students. Alongside the FBI's Katie Halinan (Eden Riegel), Five-0 will work to uncover what this terrorist cell was planning to attack on American soil.

In the crime fighters' off hours, however, Chin Ho Kelly (Daniel Dae Kim) will be working to integrate Captain Lou Grover (Chi McBride) into Five-0's social circle. McGarrett managed to strike up a friendship with the SWAT leader despite their clear differences and antagonistic first meeting, but the rest of the team has been slow to follow. Kelly, however, will take the Chicago native out for a day of spear fishing (see photos above).

"Pe'epe'e Kānaka" was penned by John Dove ("Na hala a ka makua," "Hana Lokomaika'i") and directed by Hawaii Five-0's stunt coordinator, Jeff Cadiente. The episode will feature appearances by All My Children's Reigel and Pretty Little Liars' Sasha Pieterse.

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