Similar to the issues brought up in Structuring a novel like a television or graphic novel series, I'm adjusting a saga I'd conceived as an animated TV series of ~42min episodes, 13 episodes per season. Each season is a self-contained arc of characters and locations within the longer saga.
Now I'm writing the script, and have scaled back the artwork to a more manageable "animated" graphic novel (my artwork with some interactive elements) aimed for web and tablet. I think there aren't really any publishing rules for this format, but the 42 minute episode is roughly analogous to a 48 page comic, so essentially the TV script adjusted to an animated comicbook.
Here's my problem: I have the original title of the big saga which also works as the title of the "pilot" episode. I never had official names for the individual seasons, and I'm not sure how to refer to them now (volumes?) or how to label the individual episodes (issues?).
I'm not trying to be post-modern and deliberately blur media conventions (calling my symphonies "architecture" and my comicbooks "TV shows"), or cute like George Lucas and announce I have a serialized saga prematurely. But I intend to stick to my structure: 13 sequential "episodes" for each story arc "book" in the series, however it's called.
How can I create a naming/numbering convention that is future-proof, and clearly communicates the nature of the volume/episode structure to the reader?