Thanos, The Black Order, Infinity Stones, and the plot of Infinity War, explained
Taking place about two years after Captain America: Civil War, Infinity War follows Thanos and his "family," the Black Order -- which includes Proxima Midnight, Corvus Glaive, Black Dwarf, and Ebony Maw (who we later see torturing Doctor Strange) -- as they collect the Infinity Stones to place them in the Infinity Gauntlet, a giant gold glove that allows the being wielding it to have god-like powers, like (as has been reported from other Infinity War footage) hurling a moon at people.
In the earliest of promos shown for Infinity War, Thanos was seen wearing the gauntlet with all the stones in place. Since then, Avengers 3 and 4 have stopped being referred to as a two-part movie and are now sequels that were shot back to back. In recently released set visit interviews, the Russo brothers have compared Infinity War to a '90s heist movie like Out of Sight and said the Infinity Stones are the "bedrock" of the movie. Is Thanos the George Clooney-type criminal of the Marvel universe?
All of this tells us where the plot's going up to a point. Thanks to the final Avengers: Infinity War trailer and poster, we know for sure that Thanos will obtain three of the six Infinity Gems to place in the gauntlet. The purple Power Gem, the blue Space Gem, and the red Reality Gem, what does that tell us about Thanos's actions leading into the battle on Wakanda, and based on the new trailer, the epic showdown on the orange planet Titan?
The entire movie may revolve around the collection of the missing Soul Stone. But let's show our work.