Hi, I'm just wondering where you got your data from for season 4; the new episodes you have added are a part of The New Batman Adventures, found here https://www.themoviedb.org/tv/4625-the-new-batman-adventures which is set two years after BTAS ended. BTAS has an alternate title of The Adventures of Batman and Robin, only for season 2.

http://www.tv.com/shows/batman-the-animated-series/episodes/

See that link

And these below

http://www.darkhorizons.com/shows/10/Batman-The-Animated-Series/season/4

https://www.amazon.com/Holiday-Knights/dp/B00GCEPC06/184-4263144-6425118?_encoding=UTF8&*Version*=1&*entries*=0

https://www.microsoft.com/en-us/store/tv/batman-the-animated-series/season-4/8d6kgwzlch8n

Though these episodes are considered volume 4 for the DVD release, as seen on the cover http://www.worldsfinestonline.com/WF/batman/tnba/releases/dvd/volume4/cover1.jpg these episodes are from The New Batman Adventures. http://www.dvdtalk.com/reviews/19231/batman-the-animated-series-volume-4/

I edited my post above. Please see the other 3 links that i sourced.

http://www.tv.com/shows/batman-the-animated-series/episodes/

See that link

And these below

http://www.darkhorizons.com/shows/10/Batman-The-Animated-Series/season/4

https://www.amazon.com/Holiday-Knights/dp/B00GCEPC06/184-4263144-6425118?_encoding=UTF8&*Version*=1&*entries*=0

https://www.microsoft.com/en-us/store/tv/batman-the-animated-series/season-4/8d6kgwzlch8n

Since these episodes were aired as The New Batman Adventures (almost two years after BTAS ended) and they are already in the database under that title as I referenced above, they don't belong in the main BTAS entry.

Even though they show up in more than one referenced link? Amazon AND Microsoft have them to buy as volume 4.

https://www.themoviedb.org/documentation/editing/television

We go by first airdate, which the episodes were aired as The New Batman Adventures - how they are organized on a DVD release is something completely different.