I’d have to say Death Race 2010 honestly. They peaked so early lol

(Full answer in link)
Second episode for a lot of reasons. I think the action is top notch there and fast paced in a very engaging way (they matched it in other episodes like Les Diabolique but still),the ghost was creative and very well used having him possess a number of vehicles rather than limiting him to one, WAYYYY better introduction to the series than the episode prior so it feels even better to watch lol, animation’s great, overall I think it’s the perfect episode to show someone to introduce them to the series