Teenage Mutant Ninja Turtles, Season 2

Leonardo:
(Narrating) Note to self: when Master Splinter tells you not to leave the lair, don't leave the lair. Also, do not, repeat, do not follow Master Splinter through an interdimensional portal to a nexus between multiple worlds. But, if for some dumb reason you have done all that, whatever you do, don't accidentally enter into the Battle Nexus tournament, a competition of the multiverse's most skilled and lethal warriors. And finally, if all that does happen, make sure you don't spend any time in the Pavilion of the Past Champions alone. Trust me on this one. It may just cost you your life.