The first TV on DVD I ever bought were the Avengers sets with Diana Rigg when first released in the late 90's. A definite grail show. I never considered TV on DVD before or after that until probably around 2005. I figured why buy TV shows when you can likely find them on cable somewhere. But the Avengers was something I hadn't seen for decades. Fast forward after 2005 and 300+ TV shows purchased on DVD later, I couldn't imagine watching TV any other way.