Episode 17

A new threat to the Earth emerges — the antimatter fertilizer pellets the anti-Jocelyn gave the nursery plants. Michael rushes to the nursery to separate the antimatter pellets from the matter pellets while Sam and Jason try to distract their father. It doesn't work. The molecules of the two pellet types interact causing the plants to explode leaving the nursery a shambles. The Grubs' eighth message arrives. With the nursery reopening looming, Jason tells his father he's arranged for the gala to be covered live on TV by Dr Ken who he's promised will see "the greatest show on Earth". To save the Earth, Sam decides their only hope is to teach the child-like Grubs the difference between right and wrong. The kids are desperate to get their hands on the Woop to go visit the Grubs only to learn Dump has taken it to London for five days to drum up interest in his new tanning business.