Dexter's made the most amazing scientific discovery known to man. He's uncovered alien life on planet earth! But unfortunately for the boy genius, so has Mandark. Now the two are locked in a fearsome feud over who will get the credit for this amazing find. However, soon both boys have a more pressing concern. Turns out this alien has just one thing on its mind - or rather, its stomach - and that's eating the smartest brains it can find. Now, for the first time in his life, Dexter actually wants to prove that Mandark is smarter than him. But is he clever enough to pull it off?

• Age: 48 months onwards