This post contains spoilers for Avengers: Age of Ultron.
If you weren’t sure what to make of the big purple guy (Thanos) and his shiny Michael Jackson–style single glove in the mid-credits sequence for The Avengers: Age of Ultron, you’re not alone. The so-called Infinity Stones only came to the fore in the latest Avengers movie, but Marvel superfans have been tracking Thanos’ quest to collect them all, along with that blinged-out Infinity Gauntlet, for years now. Here’s a guide to the Inifinity Stones as we’ve seen them in the Marvel movies thus far—where they’ve been, where they are now, and where we can expect them to take us in The Avengers: Infinity War.
Read more in Slate about The Avengers: