Maggie and Sam surprise Mr. Drummond for his birthday by having Kimberly return from France to visit him. She brings a present of her own, the Drummond family tree, but the happiness turns to sadness when Mr. Drummond realizes that he is the last person to carry on the Drummond name. Arnold comes up with a solution; he and Willis will have their names legally changed to "Drummond," which makes Mr. Drummond happy, but Willis has second thoughts.

Arnold's rocket---containing a camera and Sam's pet mouse---crashes into the Russian Embassy.