For a long time my answer would’ve been Doctor Who - I was an original Who fan who got hooked on PBS in the 80s and kept the candle burning in the 90s and early 2000s with books and Big Finish audio dramas. Now that it’s back and more popular than before though, I don’t know if it’d really count as “lesser known” like it used to, so for that criteria I’d have to say… Blake’s 7
Had to burn off a Sega Saturn with a huge collection of games, a Virtual Boy, and a top loader NES back when I was in deep financial trouble. Practically killed me.