The show will return with fresh episodes on Sept. 29.
Dale will become a full-time cast member after playing the recurring role of Adam Noshimuri since Season 2.
Newbie Rath will play "Tani Rey, who McGarrett [Alex O'Loughlin] recruits after finding her working as a lifeguard at a hotel pool after she was kicked out of the police academy, despite being a first-rate candidate," the network said in press notes.
"Koale will portray Junior Reigns, a former Navy SEAL who just returned from serving his country and asks McGarrett, a fellow SEAL, for a job."
Copyright 2017 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.