Web Series copyright

[Underdog]

I just filmed two webisodes from a possible 10 webisode first season. What do I copyright? The script only? Each webisode? Can I copyright one webisode and not the other? I want to cover myself. But it seems like a lot to copyright the script and the two webisodes. When I do webisode #3, do I copy right that one too?

[DGirl]

Did you ever get any kind of answer for this? I am starting a web series and have these same questions. How do you know no one will steal your show idea?

[john threat]

writers guild for script