Avengers: Infinity War is centered on the struggle for the Infinity Stones; six gems of incalculable power, each of a different kind: Space, Time, Soul, Mind, Reality, and Power. The mad space god Thanos (Josh Brolin) wants them all. It’s up to the Avengers to stop him.

Five of the six stones have been seen throughout the Marvel Cinematic Universe; you probably spotted them all when you were watching The AvengersGuardians of the GalaxyDoctor Strange and more. But did you know that each stone reflects the theme of the Marvel movie it’s in? It’s true, and this new series of video essays by ScreenCrush’s Ryan Arey explains them all. This time we’re looking at the Mind Stone, which is the focal point of Avengers: Age of Ultron and underscores how that movie is all about free will, which some characters want (Ultron), and some characters have (Vision).

If you enjoyed our Mind Stone video and are craving more Avengers and Marvel videos, check out the ones we’ve got below about the Infinity War trailer, The Incredible Hulk, and the first video in this series all about the Infinity Stones, which covers the Space Stone in The Avengers. Plus, there’s tons more over at ScreenCrush’s YouTube channel. Be sure to subscribe to catch all our future episodes.

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