It's fantastic to be invisible… until the moment comes when it's not anymore. Because how can your mom give you cookies when she can't see you?
Luckily, Stanley and Jean have found a way to decide for themselves when they will be invisible and when they won't. And for Stanley, at least, it's obvious what they should do next: take on crime, of course! And even wearing superhero costumes!

Jean, on the other hand, isn't really up for it (especially not the costumes).
But when strangers rob Stanley's family store, the kids take it personally. Will they be able to find the thieves and the stolen goods before Stanley's family is forced to sell their house? Will they manage, invisible as they are and with the help of Jean's new inventions, to foil the plans of the mysterious supervillain pulling the strings?
Get ready for battles full of crazy gadgets, sneaky attacks, plenty of burps, and an ending you can't even imagine.