The Big Giant Head announces his plans to visit the Solomons in person to chastise them for their poor mission performance. Dick tells Sally to move back in, orders Harry to stop trying to father a baby with Vicki, and tries to prepare Mary for the arrival of his old "college chum," worrying privately that the supreme leader might not find her to have been a suitable use of his time. The family goes to the airport to meet the Big Giant Head (William Shatner), a drunken good-time charlie who's taken the name of "Stone Phillips," and who, in short order, moves in and takes over their lives. Dick quickly loses favor with Stone, who's unimpressed both by his choice of girlfriend and his leadership skills. Stone is, however, quite taken by everything about Sally, especially the length of her legs and the shape of her torso, and decides to make her the High Commander instead of Dick. Meanwhile, Harry keeps trying to avoid Vicki, but eventually he tells her that they need to cool the baby thi (thetvdb.com)