The Avengers: Age of Ultron showcased the Mind Stone, which was worn by the Vision, and the film’s Blu-ray bonus video helps to explain why the six Infinity Stones will create such a dangerous power.

In The Avengers: Age of Ultron bonus features video, Marvel explains what we know about the Infinity Stones, which have been featured in many of their films over the last decade. The Vision wore one on his head (Mind Stone) and it made him incredibly powerful in Age of Ultron. Watch Marvel reveal more information about the powerful stones:

This video does a great job explaining what is sometimes a difficult thing to explain to non-comic readers. The collection of the six Infinity Stones (known as the Infinity Gems in the comics) is what every single Marvel film has been headed towards.

When Thanos (big purple alien) puts all six Infinity Stones in his gauntlet, seen during the after-credits scene in Age of Ultron, he will be a destroyer of worlds. The villain will essentially be stronger than anything imaginable in the Marvel Cinematic Universe.

It’s actually surprising that Kevin Feige has decided to use this villain and the stones as the Avengers’ finale, as the character is so insanely powerful once he acquires all six Infinity Stones. It’ll be interesting to find out how the Avengers will defeat Thanos in Avengers: Infinity War Part 2 (assuming they win).

While the story of the Infinity Stones can be a bit complicated, it’s a strong end-game for Marvel, and we’re very excited to see how the Avengers end up defeating Thanos once he gains control of all six stones. We imagine a few Avengers will be killed during the last two films, which should make for some great sequences.

The Avengers: Infinity War Part 1 will hit theaters May, 2018, with Part 2 hitting theaters May, 2019.