The kids are so fed up with their Super Hero mums and dads spending more time saving the planet than looking after them that they've formed their own group of heroes - the Super Zeroes. Which is very lucky for the citizens of Multiplicity - because the Heroes are currently falling over themselves to welcome a group of inter-planetary visitors. The visitors say they've come in peace, but anyone - apart from the Heroes, that is - can see that that's the last thing they've come in. Invasion mode, more like. Luckily Ben, Pippa, Marcus, Toby and Jewel are on hand to save the day, save the city, and save their parents' face. And they can do it without wearing their undies on the outside.