Samurai Jack

You really can't say enough about how wild it was to see a TV series bring a lineless style to the small screen. The pushed shape language, incredible environment art (new locations every episode!), and second-to-none action choreography are all impossible to miss.
This series came around at such a formative age for me, it's hard to overstate the way it altered my brain chemistry. Samurai Jack refused to settle. Some of the greatest action television ever, much less animation, is included among these episodes. But it also had some of the best slapstick and comedic work at the time.
I think it's easy to remember the show for its prestige moments of action and mythic storytelling, but it was relentless in its pursuit of fun and bombastic moments, and that's the part that sticks with me.