When Mary invites Dick to accompany her on an archeological dig, he eagerly accepts; he's seen "Raiders of the Lost Ark," so he knows how exciting and dangerous archeology can be. The Rutherford Garlic Festival is underway, and hotel rooms are at a premium. Since Dick's gone on the dig, the other aliens decide to rent out his bed. Soon the Solomons' apartment becomes "The Inn at Solomon House" with Tommy and Sally committed to giving their guests outstanding service in hopes of earning four stars in the Crown Travel Guide. Harry's not enthusiastic about the new venture, because he gets to do all the dirty work.
At the dig, Dick's disenchanted when Mary gives him a trowel, a brush and an air bulb and tells him to carefully dust the sediment in one square foot of land. Dick grudgingly gets to work and later complains that he's been working five hours and all he's found is a pointy rock. Mary's astonished when she identifies his "pointy rock" as a spear head. She sadly confesses that she's been going on digs for years and has never found anything. She's had to buy the artifacts in her office and has even gotten some from eBay. She says she would have killed to have found the ceremonial wedding moon that Dr. Powell, the leader of the dig, uncovered earlier. Dick tells her not to worry; he's sure she'll find something.
Harry's fed up with his new job and resigns; he shows up shortly afterward and wants to register as a hotel guest. If he can't be a guest, he'll write a negative letter to the Crown Travel Guide, so Sally and Tommy reluctantly allow him to register. Harry immediately becomes guest from hell, demanding constant massages and tickets to "Les Mis."
Back at the dig, Mary sees little point in continuing, because she's sure she won't find anything, but Dick insists she go on. He slyly plants something where she's been digging, and soon she unearths a wedding moon identical to the one found by Dr. Powell. She's ecstatic until it's revealed that, in fact, it is Dr. Powell's, and she's accused of being a thief. She's furious with Dick, but he assures her he was only trying to make her feel better.
Sally can't bear another minute of waiting on Harry hand and foot, so she announces that she too is quitting and will be registering as a guest. Tommy says nothing doing. He's sick of the whole thing. Together the aliens order their unsuspecting hotel guests out of their house.