The Hawaii Five-O team is tasked with protecting the president from an assassin in the show's Nov. 22 episode and Steve McGarrett's (Alex O'Loughlin) aunt gets into trouble for trying to buy illegal drugs.

A preview video for Hau'oli La Ho'omaika'i begins with a voice-over saying the president is on his way to the island and that his safety is in danger. Intelligence officials believe an assassin might attempt to kill the president on his trip to Hawaii. The Hawaii Five-O team has to step it up and be responsible for the president's security.

The tag line in the clip suggests that the team is the only thing that stands between the assassin and the president.

The intensity is then diluted by the comedic entry of Steve's aunt Debb, played by guest star Carol Burnett, who is visiting for Thanksgiving. Burnett suprises Mcgarrett by showing up at his door and while he is happy about that, her trip is not without trouble. Viewers see Debb behind bars, implicated for trying to purchase "some grass." She tells a stunned Steve that she did not know that the dealer was actually a narc.

Nick Jonas guest starred as an antagonistic hacker in the last episode of the show. The episode, Akanahe, also focused on the difficult relationship between McGarrett and SWAT captain Lou McGrover (Chi McBride), as the two are forced to work on a case together.  

The episode featuring Burnett airs Nov. 22 at 9 p.m. E.T.  Watch the teaser below.

Tags: Hawaii Five-O CBS