If you meant a specific or 18 — note that Episode 720 is in the Dressrosa Arc , not Marineford. Episode 18 is in Syrup Village Arc .
Here is a brief breakdown of the episode range: one piece marineford arc download exclusive 72018
Netflix added Marineford in some countries (Japan, US, Canada, etc.). Downloads available in app for offline viewing. If you meant a specific or 18 —