I had an Idea for a show in which Mario & Luigi accompany Princess Daisy, who is trying to rescue her childhood friend, and ally of Sarassaland, Princess Peach, by using a mysterious stone to find each of Bowser's clones, and vanquish them, (although she decides to stablize Bowser Jr. as he isn't very evil & doesn't know who the real Bowser is)
The evil Alien Tatanga is Allied with Bowser, Wario, and others, who plan to merge the two worlds & rule (unknowing that Tatanga will betray them) Captain Syrup, E. Gadd, & others join the resistance,
After Tatanga is stopped, & Peach is rescued, Wario & Waluigi begin their Rivalry, Toad Town falls into a deep sleep in Subcon, and The first Mushroom Kindom Grand Prix begins, with Sonic crashing after a fight with Dr. Eggman has him zoom through the track, and slip on a Bannana Peel, causing him to lose the race...
...and return for the 2008 Olympics