As we already know, the one that appeared in the first avengers film is Thanos, the mad titan. Since Thanos is involved then the infinity gems would be as well.
Until now we had seen 2 - 5 infinity gems, and 2 or 3 of them were probably under Thanos' possesion.
Now lets see all the Infinity Gems
1. Space Gem (Tesseract)
First is the space gem, It was shaped like a cube and can be used to open portals in space (at the end of the avenger) or provide teleportation for the wielder (as what happened to red skull in captain america), it was now under the possession of Asgard, stored in Odin's Vault.
2. Power Gem (Aether)
Second is the power gem, it was liquid like shaped and more aggressive than the space gem. It usually bonds to the wielder (like when it was bonded to Jane Foster, and Malekith) If the wielder can control it, it would give the them the power to turn Matter into Dark Matter. But it will corrupt or cause dangerous side effects to the wielder if they cannot control it. It was under the hand of The Collector for "Safety"
3. Reality Gem (assumed)
The Next is the orb from the brief scene of the GOTG movie. Most people think it was reality gem, personally I also think that it would most likely to be the reality gem. It give the wielder power to alter reality even if it broke the law of nature.
4. Mind Gem (assumed)
The Next is Loki Scepter from the first Avenger Movie, most people think it was the mind gem, but personally i think it wasn't the mind gem, cause thanos wouldn't trust loki with an Infinity Gem just to take another Infinity gem especially when he know that loki was the god of mischief himself. Instead I think that thanos already possess the mind gem to take control of the chitauri race, then he give a portion of the mind gem to power loki sceptre. It has power to control other people mind and to read people mind.
5. Soul Gem (assumed)
Next is Soul Gem, It has power to create, destroy, and manipulate soul. It probably would be introduced in Avengers 2 : Age of Ultron. Since Tony Stark is the new "daddy" of Ultron, the soul gem would be used by Stark to create Ultron (since Soul gem have the power to create soul) and would later Corrupt it.
6. Time Gem (assumed)
That left 1 infinity gem to be introduced in Phase 3, The Time Gem. It give ability to time travel and manipulate time. It most likely would be the last gem to be introduced, it probably would be used by the red skull in captain america 3 (to survive after centuries) or would be used by another villains that master time travel (like Kang the conqueror).
Well, after we've seen all the infinity gems, it wouldn't be fair if we don't include.....
7. Infinity Gauntlet
As we know, infinity gauntlet was shown as one of the Easter egg in Thor 1. It was spotted inside Odin's Vault. It was the only thing that could contain all the 6 Infinity gems at once. After Fully Powered It give the wielder Unlimited power to control the universe. It was in the hand of Asgard, inside Odin's vault
Anyway after Thanos appearance in Avenger mid credit scene the infinity gems start to take place on every MCU movies and it would lead constantly to the event of Infinity gauntlet, which would be the end of Marvel Cinematic Universe's phase 3.
There you have it folks, all of the Infinity Gems, what movies they have been in to date, what they do, and where I think the others will show up. What do you think, do I present a good argument for my beliefs or do you have a different take on what will transpire before Avengers 3 hits theater.Do you have your own theory? Any questions? Comments? Share below!!!!!