Maybe you were too young / weren't born when it started. Maybe it wasn't your cup of tea. But then, one of the sequels came out that just took the entire industry by storm, and everyone and their mother is trying it for the first time. Simply put, what game franchises have flown under your radar until "2", "3", and so on?
I believe it was my second or third game for the Nintendo 64. I did go back and play the considerably more difficult SNES original years later. But with the most recent release of Star Fox Zero, nothing has come close to the 1997 masterpiece that was StarFox 64.
Elder Scrolls IV: Oblivion
After this game released in early 2006, Game Informer accurately reported that "Oblivion has sold so many copies, people with lives must be playing it now." Indeed, I was among those, and while I may not have a life, this was my first fantasy RPG, and it sucked the hours away. Last I checked, at least 120 hours went into my adventure in Cyrodiil. At least 260+ hours have gone into Elder Scrolls V: Skyrim as well, but luckily, each ES game is its own epic, as I have not gone back to try Elder Scrolls Arena, Daggerfall, or Morrowind.
Witcher 3: The Wild Hunt
Another fantasy series I discovered because of the hordes of awards it was receiving. Granted, I probably wouldn't have given this a try if it didn't come free with my gaming rig I bought last summer. However, the cast of characters do hail from the previous two games, which I just picked up for less than $5. But at this point, I'm trying to beat the vanilla version of Witcher 3, unsure if I'll have time for the DLC, or Witcher 1 or 2 before No Man's Sky comes and whisks me away from every other game. So I'm wondering if it would serve me best just to read the book (first published in 1991), which was very recently translated to English, thanks to the popularity of the games.
I'm sure there are others, but those are the biggest three for me. What about you folks?