Does "Saint Seiya Omega" series have a prequel? When Saint Seiya Omega starts, there is an evil character named Mars, which seems to be defeated by saints before. But I have never seen him in the previous series. Some of the plot is built on past events about which we are assumed to have a priori knowledge. It is strongly like this series have a prequel.

I have watched these TV series:


Saint Seiya
Saint Seiya - Hades Chapter OVA - Sanctuary
Saint Seiya - Hades Chapter OVA - Inferno
Saint Seiya - Hades Chapter OVA - Elision
Saint Seiya - The Lost Canvas


But still I can't tie up any of them with the currently ongoing Saint Seiya Omega series.

Does "Saint Seiya Omega" have a prequel?
The only thing which comes between Elision and Omega is the movie
Saint Seiya: The Heaven Chapter - Overture. The Lost Canvas is a prequel.

However, according to Wikipedia, it is an anime-original story separate from the original continuity, and you aren't assumed to have watched all the previous series. As far as I know, Mars only appears in Omega, so there are definitely some unexplained points which might get answered in flashbacks or might remain forever unexplained.