Sometimes I have started to see a serie, and there are previous seasons. Or I have seen a single episode.

At Seriesfad you could see if you have seen it all, or that you did miss an episode, or a previous season. With little stripes you could see the amount of seasons. I unfortunatily did only make one screenshot, but there you can see what I mean. I missed an episode of Cesar. And there are a lot more seasons to see from call of duty.

I like this very much. Can you make something similar?