Leonardo goes to Japan, traveling on foot through the snowy mountains, seeking a new sensei known as "the Ancient One".
Wow, that sounds very very familiar.
On his quest, he comes across two gigantic yeti warriors that bar his way with their huge swords.
"The yetis demand to know what the Turtle seeks. Leonardo informs [them] that that he's come to see the Ancient One. The two guards laugh and begin to mock the young ninja. Leo grows angry and draws his katanas, growling that he hasn't come all this way to turn back now. The ninja attacks, but his efforts are futile against the giants' armor. The giants start to tease Leo even more until he finally snaps and lets out a mighty howl of rage. The guards easily defeat Leonardo and throw him into a snow-filled ditch, where the Turtle lies prone in defeat. Surprisingly, the yeti guard lifts the Turtle to his feet. The warriors tell Leonardo that this lesson was to teach him to never go into combat with an angry heart. With that, the pair explain how Leonardo will find the path to the Ancient One and send him on his way. Leo continues on, following the giants' instructions."