A friend of Robin's comes to the estate to finish writing her mystery novel, and Magnum is frustrated when she takes over the guest house and the Ferrari.
When Magnum accidentally crashes the estate's security system, he calls Mac to help him get it running prior to a multi-million dollar jewelry design contest.
Fred is grumpy during the holiday season, leaving attempts to make him cheery short lived, but while he is sleeping, spirits show him the error of his ways.
Fred heads to Hawaii to attend a "Junkmen of America" convention, but jewel thieves sneak some stolen items on him so he can unknowingly transport them to L.A.
While Fred & Lamont are in Hawaii, jewel thieves hide stolen items in their luggage for transport, and Fred & Lamont find them and debate telling cops.
Cousin Naomi is visiting the Evans' for Christmas but her visit is not a happy one for Thelma, who discovers that Naomi has a serious drinking problem.
Rabbi K.A. Schneider, a believer in Jesus and end-times messenger of the Lord, delivers the Word of God with clarity and the true passion of the Holy Spirit.
Quincy faces new obstacles in his fight to convince both lawmakers and the pharmaceutical companies to provide funding for drugs that treat rare diseases.
A hitman imprisoned by Jim's efforts is released and threatens revenge, and Jim goes into hiding until his friend Angel accidentally reveals his whereabouts.
Sam leaps into a greedy contractor's valet on Christmas Eve in 1962, and he and Al use some holographic tricks to "Scrooge" his boss into having a heart.
Sam leaps into a young man from his own home town in the process of robbing a bank with his brothers, and Al tells Sam he is there to get the boys to surrender.
A hitman imprisoned by Jim's efforts is released and threatens revenge, and Jim goes into hiding until his friend Angel accidentally reveals his whereabouts.
As T.C. is flying Magnum, Higgins and Rick to their various destinations on Christmas Eve, he is forced to make an emergency landing due to helicopter problems.
Agatha unwittingly invests in a shady company and hires Magnum to recover her money; Higgins' cousin arrives to marry a wealthy heir but needs a makeover.
While Fred & Lamont are gardening, a passing expert reveals they may have oil on their property below ground level, and Fred winds up discovering the truth.
When Keith's unforgiving boss insists on making him work on Christmas, the Evans family moves the holiday celebration to his job at the taxi cab company.