Thundercats is considered an "American" cartoon, but the American animation never lived up to the promise of its intro that wasn't even animated stateside; the Japanese animators threw down the gauntlet with the intro, and it was my first real taste of what and action cartoon should be. Even as a small child I wondered why the hell the show didn't look and move like the intro all the damn time.
#9: Dragonball Z: American Intro
In terms of my first real anime love, there is nothing that pumped me up more as an 11 year old than the American Dragonball Z intro. Coincidentally, it was also the first major breakthrough for an anime that didn't have the Pokemon moniker. I dovetailed into this series hard, even buying the freshly subbed VHSs from Funimation just so I could be the first to see the Trunks saga.
#8 : Ghost in the Shell: Stand Alone Complex
I could never get into the series, but I never stopped loving this intro. For me, it hits the nostalgia buttons hard, as the composer is the same that did Final Fantasy VII. Beautiful work and animation.
#7: Naruto Shippuden: Intro 8
Love the manga and the anime (when it's not suffering from boring filler), and the intros are consistently so good, that you could probably include 4 of them on the list; what more can you expect for the #1 show in all of Japan? This is the latest intro as the show shifts back to the main storyline.
#6: Cowboy Bebop
This is a show that trancended the genre, with dialogue, action, and editing more akin to a Tarantino's Kill Bill. It's space "Jazz-opera" concept is one of a kind, and it's no wonder that American filmmakers are still clamoring to get a live-action adaption going.
#5: Samurai Champloo
The spiritual successor to Cowboy Bebop, this time twisting the wandering samurai genre up with a hip-hop flair. The show in its uncut form is hard to come by on Cartoon Network, dumped to the middle of the night for it's harder edge and violence.
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