OK, think back to 1991. Best things ever? TMNT and Power Rangers. What could be better than mixing the two? Nothing. And with that, I give you a link to the TMNT/ Power Rangers in Space crossover, episode 04-Shell Shocked. Link is for the full episode (which I would post, but "embedding has been disabled by request"), but here, found by Technophile on IRC is this quicky video. But do yourself a favor and watch at least the one provided in the link, as your mind will be blown.
First part of episode
Thanks IRC pals, I couldn't have done it without you. Also, notice the inclusion of female turtle, Venus. She's retarded.