Hi @ballazx, not in 1 request, but there is a way can do it in 2. If you you make a top level series call to get the number of seasons that are present, you can then use append_to_response to grab them.

An example grabbing the first 2 seasons of Game of Thrones:

https://api.themoviedb.org/3/tv/1399?api_key=###&append_to_response=season/1,season/2

Since the API doesn't fail on nonexistent append_to requests you can add 0-19 (it will only take 20 sub requests in all) should be plenty for most series? Reduce numbers if you have more sub requests... (edit suggesting from 50 after trying out...)