With the trailer for Avengers: Infinity War having finally touched down, fans are eagerly awaiting the superhero ensemble, excited to finally see every corner of the Marvel Universe unite.

However, even for those clued up on Iron Man, Captain America, Guardians of the Galaxy, and everyone else in-between, remembering where all those Infinity Stones were last seen can be quite a struggle.

Well, look no further, as here’s a quick catch-up on what’s going on with Thanos and where those pesky Infinity Stones are now.

First off, who the hell is Thanos? Remember post-first Avengers there was a purple guy sat on a floating chair — that’s Thanos. The villain also appears during the first Guardians of the Galaxy, sat once again on a floating chair.

Known as the Mad Titan, Thanos wishes to rule the galaxy for an unknown reason in the Marvel Cinematic Universe. However, in the comics, the Dark Lord brings destruction in order to court the embodiment of Death.

Avengers: Infinity War trailer breakdown Show all 31 1 /31 Avengers: Infinity War trailer breakdown Avengers: Infinity War trailer breakdown Doomsday Open on a mysterious shot of an orange planet... Avengers: Infinity War trailer breakdown Crisis ... which seems to hold a distraught Tony Stark. Has something tragic occurred? Avengers: Infinity War trailer breakdown Return to Earth Dr. Strange and Wong look down at Bruce Banner, who appears to have crashed into the Sanctum Sanctorum in New York. Thor: Ragnarok ended with Bruce in space with Thor, coming face-to-face with what appeared to be Thanos' ship. Was he thrown out and returned to Earth in the attack? Avengers: Infinity War trailer breakdown A Vision of Love Vision in a new form who happens to look a lot like Paul Bettany, so he can romance Scarlet Witch with a hotel getaway... or something. Avengers: Infinity War trailer breakdown Blond Ambition Black Widow's new locks. A disguise post-CIvil War? She did end up siding with Captain America, after all. Not sure it's working, though. Avengers: Infinity War trailer breakdown Welcome to Wakanda Both Black Widow and Bruce Banner are in Wakanda, with a part of Iron Man's Hulkbuster suit to boot. Avengers: Infinity War trailer breakdown Team Up Bruce's arrival into NYC also sees Tony Stark supposedly turn up to welcome his return. And maybe catch him up on the whole Civil War thing. Avengers: Infinity War trailer breakdown I've Got a Bad Feeling About This Spidey senses in action! Avengers: Infinity War trailer breakdown Here We Go Again It's not a Marvel movie if there's no portal in the sky, after all. Avengers: Infinity War trailer breakdown Destruction Dr. Strange, Bruce, Tony, and Wong are here to stop the portal's destruction of the city. Avengers: Infinity War trailer breakdown Bad Blood? Your suspicions Loki was going to go after the Tesseract during Thor: Ragnarok are 100% correct. It happens to contain the Space Stone, one of Stones Thanos is after, so what's going on here? Is Loki actually offering it up to him? Has he gone back to his villainous ways? Or could this be something else? Avengers: Infinity War trailer breakdown Thanos This big purple dude is, of course, Thanos. He's making his grand entrance. Avengers: Infinity War trailer breakdown Robo-Spidey It's Spider-Man in the portal above NYC flaunting a brand new suit courtesy of Stark Industries. Avengers: Infinity War trailer breakdown Power Move Hard to guess where Thor is right now, but it's not a Marvel movie if one of the Chrises doesn't get to flex their muscles. Avengers: Infinity War trailer breakdown Proxima Midnight One of Thanos' children and a member of the Black Order, which consists of a bunch of his adoptive children. She's here in Edinburgh's own Waverley Station. Why? Who knows! Avengers: Infinity War trailer breakdown Guess Who's Back? Captain Beardmerica. Avengers: Infinity War trailer breakdown Back Again Here to save Scarlet Witch. Avengers: Infinity War trailer breakdown Tell a Friend Black Widow is also seemingly in this scene, if the benches behind her are anything to go by. Avengers: Infinity War trailer breakdown Hulkbuster Iron Man's suit is here in action in Wakanda, but there's one question: is that Tony Stark inside? Avengers: Infinity War trailer breakdown Battle Time And so we get to a major battle for the MCU, with Captain America pitching in to fight. Avengers: Infinity War trailer breakdown Claws Out Alongside Wakanda's leader Black Panther, taking on one of Thanos' foot soldiers. Avengers: Infinity War trailer breakdown Uh Oh Remember Iron Man looking distraught on an orange planet at the start of the trailer? This might be why - that's Thanos doing the crushing, by the way. Avengers: Infinity War trailer breakdown Oh No Vision has the Mind Stone embedded in his forehead, so if Thanos is set on completing his Infinity Gauntlet of Stones, we'll be having to say goodbye to Vision. And from the looks of it here, it might be Proxima Midnight who does the murderous deed. Avengers: Infinity War trailer breakdown Infinity Gauntlet So Thanos has the Space Stone (in the Tesseract, so it looks like Loki may have gone bad again) and the Power Stone, which was last seen locked up in Nova Corps at the end of Guardians of the Galaxy. Avengers: Infinity War trailer breakdown Bucky Since we last saw him being put in cryogenic sleep in Wakanda until a brainwashing cure could be found, uh... presumably they found one? Avengers: Infinity War trailer breakdown Step into the Spotlight The Wakanda army is ready to face off. Avengers: Infinity War trailer breakdown Air Power With some help from Falcon... Avengers: Infinity War trailer breakdown Lord of the Things ... against Thanos' army. It's all very epic. Avengers: Infinity War trailer breakdown Avengers Avenging The money shot everyone's been waiting for. Avengers: Infinity War trailer breakdown An Eye for an Eye Here's Thor post-Ragnarok, sporting a very fetching eyepatch. Avengers: Infinity War trailer breakdown GOTG Vol. 2.5 He's meeting up with The Guardians of the Galaxy. Chris, meet Chris. Let's go help other Chris.

How will Thanos come to bring death and destruction the galaxy? Using the reality-bending Infinity Stones, of course! Once all six stones are brought together, Thanos will have unprecedented power, capable of destroying and enslaving entire planets. As Marvel fans know, we’ve already seen five of these six stones.

First, there was the Space Stone, which has taken the form of the Tesseract. The stone was briefly seen in Thor, then a relatively large role in Captain America: The First Avenger, going on to act as the key MacGuffin in Avengers during which Thanos employed Loki to take the Tesseract from Earth. However, after losing, the all-powerful object was taken to Asgard. Following Ragnarok, the Tesseract was seemingly taken by Loki — the Infinity War trailer confirming as much.

When Thanos sent Loki to take Earth, the God of Mischief was entrusted with the Mind Stone. This stone was held in Loki’s Sceptre and was later retrieved by the Avengers. After Tony Stark experimented on the Mind Stone, Ultron was born, an event that eventually led to the birth of Vision. The Mind Stone now sits on Vision’s head — presumably, Thanos will have to kill the Avenger to retrieve the Infinity Stone.

During Thor: The Dark World, we were introduced to the Reality Stone, called the Aether, which took over Jane Foster and almost killed the character. After being extracted from the now-forgotten love-interest, the stone was given to the Collector on Knowhere, He supposedly still has it.

The Collector also almost got hold of a second stone, the Power Stone. During Guardians of the Galaxy, Peter Quill almost leaves the world-destroying Orb with the Collector before Ronan comes and messes everything up. Eventually, the Guardians retrieve the stone from Ronan and it to the Nova Corps on Xandar, where the stone remains.

Thanos with the Power and Space stones

The fifth stone was seen during Doctor Strange inside the Eye of Agamotto. Strange uses the powerful necklace, which contains the Time Stone, to defeat Dormammu. During Ragnarok, we see Strange wearing the Eye.

Finally, there’s one final stone missing from all this: the Soul Stone. As heavily hinted at by the heavy inclusion of Wakanda during the Infinity War trailer, many fans believed the final stone would heavily feature in Black Panther. However, as Ryan Coogler has confirmed, there are no Infinity Stones in the movie, leaving us to questing when exactly the Soul Stone will appear, if at all.