Yes, there was a "sort-of" unofficial crossover for those that didn't immediately get my joke. While recently digging through my storage area i came across my old ninja turtle figures that transformed from their non mutated form to the mutated form. one of them i have transforms into a vehicle. They were all part of a sub-line called the Mutations. There were the original mutations, auto-mutatin', and road ready mutations. The originals were the main characters. The auto-mutations were simply the turtles donning ninja gear. The road ready mutations are the ones you guys would be most interested in. They took the turtles, splinter and shredder and made them able to transform... err mutate into vehicles such as the driller that shredder always used, the turtle van, and oddly enough a porsche, a firetruck...yeah see any similarities guys? It's sure is weird to see these guys again what with all the crossovers going on right now. Even though these are not transformers it's cool to see the transformation gimmick in other toys. Here's a website to check out if you all want to see pictures. http://www.tmnttoys.com/figures.html scroll down to '92 and '93.