The Last Leg: A Final Act of Desperation

is episode 106 of the original Naruto anime.

Synopsis
With Sakura Haruno and Sasuke Uchiha defeated, it is up to Naruto to defeat Aoi so Idate can continue the race. After a few failed attacks, Naruto is finally able to defeat Aoi, which means Idate can continue the race. Though Fukusuke is already near the finish line, with determination and encouragement from Naruto, Idate manages to catch up and win the race, saving the Wasabi family.