What would these have in common you may ask? Why they have all been inspired by the formula of the ninja turtles of course! Some being good, others not so much. But for the sake of entertainment, it would be nice to see how these crossovers would actually work out.
-Street Sharks meet Extreme Dinosaurs: yes, I'm sure there's still a fan base for these shows still. From what I understand, Extreme Dinosaurs were a spin-off of Street Sharks. Four dino mutants and four shark mutants meeting face-to-face. The plot could go along the cliched lines of both team meeting under misunderstanding circumstances, they may fight do to misunderstanding and of course team up to take down the villains.
-Battle Toads of Moo Mesa (Battle Toads and WILD WEST C.O.W.-BOYS OF MOO MESA): okay so I doubt ANYONE has heard of the latter but yes, it was an animated cartoon series. I had thought that the plot of how this went would be that the Battle Toads (based on their video game roots and NOT the animated show) would be zapped into the world of the c.o.w.-boys when trying to confront the Dark Queen and her forces. The toads would be lured into the world thinking that it was another of the villains' plans. Again, depending on how this plot would work, this crossover would be okay but entertaining in a cheesy kind of way.
*interesting facts: the C.O.W.-Boys actually teamed up with the Turtles once in a comic book.
And it seems that the roads had a video game crossover with the Lee brothers in Battletoads/Double Dragon. The crossover with the characters from the Double Dragon series along with the battle toads had some liberties taken. The plot from what I found was that the Dark Queen and Shadow Boss team up and the five heroes (the three toads, Zitz, Rash and Pimple, and the two Lee brothers, Billy and Jimmy) must stop them.