Super Mario Bros. Z (2006 – present)

Super Mario Bros. Z is a British fan-made flash-animated web series created by Mark Haynes. It is a crossover between the Super Mario and Sonic the Hedgehog franchises, while incorporating elements from the Dragon Ball Z series. The series follows Mario joining forces with Sonic the Hedgehog to prevent Turbo Mecha Sonic from collecting the seven Chaos Emeralds and destroying the world. The series remains unfinished, a reboot started in 2016.