A twin brother and sister believe that their newly born baby brother is actually an alien who is preparing the way for an invasion from outer space.
The twins have an idea to get rid of the sprogs once and for all, but things get more complicated than they planned.
The family goes to a health farm where the twins think monsters are hiding in the lagoon.
Lucy and Louis think they have found a way to warn people about alien sprogs - music!
The twins think that a new restaurant is going to turn everyone in the town into zombies.
The twins think that BB3B is controlling people through the smell from his nappy.
Chubba is replaced by a mysterious nanny who the twins suspect to be a robot.
The twins build a time machine to warn their parents of the alien plot.
The twins discover BB3B's plan to communicate with fellow sprogs in outer space.
BB finds an interesting discovery in the backyard. Meanwhile, Nana is determined to deliver her love poem to Mr Weinberger.
A tornado is heading for Sunnyfield and the twins think they know who can help.
A visit from Uncle Rich leads the twins to uncover a sprog-plot to drain human brains.
The twins think they have found an alien hatching farm.
A new theme park has opened in town called Space City.
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