
Wendy has been nominated for the Nobel Prize for Science for the truth serum she's been working on in the spare room. The dress code on the invitation to the award ceremony says Scientific yet sexy: no white coats and Wendy decides to get her hair done. While she's out Bob and Rex consume the serum, which makes for a revealing afternoon particularly when Wendy returns and they tell her she's bald.
Rex arrives home to find that there's a mouse in the kitchen. But this is no ordinary mouse, he is preternaturally strong, extremely aggressive and refuses to be kicked out. The Gang even resort to getting Tiddles the Cat round to sort him out. Then the mouse reveals that he was once Rex's pet mouse, Morris, who Rex sold to Dr Dogg for animal experimentation. A tearful reunion ensues.
Wendy's on heat and the Gang's house is besieged by amorous hounds. The Gang draw down the blinds and prepare to repel borders, but one dog, Handsome Rex catches Wendy's eye and she agrees to go out on a date with him. Vince and Rex insist on chaperoning her. By the end of the evening Rex has made a new friend, Vince has fallen in love with a lobster, Arthur Dustcart's had his underpants cleaned and Wendy's in a very bad mood.