TV has both arc based and stand alone shows. Though the stand alones are getting less common. The Law and Orders were the most sucessfull of recent stand alones. I guess CSI are stand alones. Haven't watched enough to be sure. Many shows are a mix ( especially sit coms) with sub plots connecting what are mostly stand alones main plots.
The season analogy tends to fall apart because there usually isn't a break in comic production like there is in TV.