Professor Calamitous is back with an all new dastardly plan!

By following another of those self-help books, namely "How To Build a Doomsday Device in 12 Easy Steps", Professor Calamitous' latest scheme is almost complete.

Almost... because as everyone knows, Professor Calamitous never finishes anything.

With just the 12th Step left - the Professor, true to form, misplaces the stolen Fairy, Ghost and Jellyfish Energies his contraption needs to bring Retroville to its knees, and with it, the end of Jimmy Neutron's reign as resident Genius!

But, just in time, Jimmy hears of Calamitous' scheme and discovers it's even bigger than first thought; Bikini Bottom and Amity Park are in danger too! Step forward Danny Phantom and SpongeBob SquarePants!

Take control of Danny and SpongeBob to recover all of the Energy Orbs from Retroville, Bikini Bottom and Amity Park. Careful though, the Energy is unstable and certain Orbs need to be removed as a priority!

And watch out for Professor Calamitous' unfinished and erratically behaving robotic inventions. They chomp!