Contest: Crossovers! As kids, we often mashed our toys together, regardless of Copyright. Superman would take command of G.I. Joe to defeat the combined forces of Doctor Doom and the Decepticons, while Barbie took a break from her idealistic lifestyle to become a Pokemon master. And the Teenage Mutant Ninja Turtles got recruited into Starfleet and taught Spock the wonders of pizza. (And from the furor arose Mister Rogers in a blood-stained sweater.)
And thus, the Crossover was born. It's something we never really outgrew, either. To this day, seeing our favorite characters from different stories meet and compete is a guilty pleasure that we all like to indulge in. So now's your chance to indulge yourselves for prizes!