It's been a busy few weeks for the 'Hawaii Five-0' casting team. Hot on the heels of the news that Terry O'Quinn and Tom Sizemore are joining the cast for Season 2, we hear that Richard T. Jones is the latest actor to start packing his beach towel and shorts.

According to TVGuide.com, the 'Terminator: The Sarah Connor Chronicles' star has has signed on for a recurring role as the new Governor of Hawaii.

Jones will play the previously unseen Lt. Governor, who steps in to replace Jean Smart in the governor's mansion. Her character, Governor Pat Jameson, was assassinated in the Season 1 Finale after being exposed as a traitor.

A source close to the show said that this new -- as yet unnamed -- governor will be more conservative than Jameson and keep a tighter leash on Steve McGarrett and his team.

Last week it was announced that 'Lost' star Terry O'Quinn has booked a recurring role on 'Hawaii Five-0,' and now we hear that Tom Sizemore is joining the cast for a multi-episode storyline.

According to 'Entertainment Weekly,' Sizemore will appear in several episodes of the cop drama's upcoming second season. 'The 'Saving Private Ryan' and 'Black Hawk Down' star will play the head of Hawaii Police's Internal Affairs unit.

After the twists and turns of the debut season, Sizemore's character will be actively investigating the Five-0 unit. A hardboiled former Detroit Homicide Detective, he reportedly won't cut Steve and the gang any slack.