That honor goes to the Rurouni Kenshin Tokyo arc intro. Being how it brought a sequence of portrait stills of many of its villains until the big bad of the Kyoto arc. The English vocalist on the intro's lyrics was pretty silly but substantial and grabbing. I like how Sano and Yahiko were present with their scenes. The choreography in the next-to-last scene of Kenshin fighting these ninja baddies and defeating them with his reverse-blade sword. Amazed by that whole thing.