In a fairly generous case of "try before you buy, leading up to the October 25th DVD and Blu-ray release of the latest Naruto full-length feature, Naruto Shippuden The Movie: Bonds, Viz is streaming it and the other four feature films for free through October 23. The full lineup of movies include Ninja Clash in the Land of the Snow, Legend of the Stone of Gelel, Guardians of the Crescent Moon Kingdom, and Naruto Shippuden: The Movie. You'll be able to watch them all on Vizanime.com and Hulu in both dubbed and subbed formats.
Here's the official synopsis for Bonds from Viz:
In NARUTO SHIPPUDEN THE MOVIE: BONDS (rated TV-14), a group of mysterious flying ninja have arrived from overseas to launch a sudden attack against the Hidden Leaf Village, leaving behind a wake of destruction. The group is revealed to be the “Sky Ninja” from the Land of Sky, a nation thought to have been destroyed by the Hidden Leaf Village long ago. To save their village, Naruto and his friends set out to stop this new threat. During the course of the mission, Naruto crosses paths with Sasuke, his friend who has parted ways from the Leaf Village.
You can catch all of the movies on their dedicated channel on the Viz site. Naruto Shippuden the Movie: Bonds will be available on DVD and Blu-ray on October 25.