The ghosts start a new venture with "Rentapotion", but Mr. Claypole's new products have drastic side effects. To keep the business on track, Fred Mumford sends for a friend of Catastrophe Kate's to help them out: Hazel the McWitch.
Mr. Meaker buys a new clothes shop, and hires the ghosts to renovate and work in it. But when his demanding nature becomes too much for them, they decide to strike and go on holiday in protest.
Ethel has given Harold an ultimatum - he must choose between her or Rentaghost. Wanting to help fix their marriage issues, Fred Mumford enlists the advice of a female ghost, in the form of Catastrophe Kate.
The Rentaghost team decide that they want to open up a new restaurant. But when their culinary skills don't prove up to the task, Fred calls on the McWitch to see if her potions can help out with the food.
Mr. Meaker has become obsessed with going to the gym, and Fred's dad is dangerously unfit. Concerned for the physical welfare of them both, Ethel and the Rentaghost team assign Mr. Claypole to watch over them to ensure their safety.