Avengers Infinity War.. Ok so there are a lot of things going on in this movie. It starts off with Thanos having already gotten the power stone, he attacks the Asgardian ship from the end of Thor 3 and kills all of it's people including Loki who brought the tesserac with him before Asgard blew up. The bifrost guy sends Hulk down to earth and Hulk tells Dr. Strange that Thanos is coming. They all tell Iron Man and then Spiderman gets involved when Thanos' goons are trying to take the time stone from Dr. Strange. Iron man and Spiderman get stuck on Thanos' ship while they have Dr. Strange.
On earth, Vision and Wanda are like dating or whatever and are wanting to become non super heros and live a normal life, but then Thanos' peeps find them and try to take the mind stone from Vision. Black Widow, CA, and Falcon come to help them and they manage to get away, but Vision is injured. They all go back to the Avengers headquarters and meet up with Banner and Rhodes and decide to go to Wakanda so that Vision can be healed since he isn't a normal human and Wakanda has advanced stuff. Vision tells Wanda to destroy the mind stone so Thanos does not get it, which would end up destroying Vision as well, but Wanda won't do it.
Then the Guardians find Thor's ship in the galaxy, and Thor hits their ship and is still alive. They bring him on board and he tells them about Thanos. They figure out that Thanos is on his way to the collector to get the aether or Reality stone and Thor wants to get a new weapon since his sister had destroyed his hammer in the previous Thor. Thor takes Rocket and Groot with him. Gamora, Drax, Quill and Mantis go to stop Thanos. Gamora tells Quill before they go that if Thanos captures her, for him to kill her. Turns out that when they get to where Thanos is, he already has the stone, takes Gamora, and when Quill finally tries to kill Gamora with his gun, Thanos uses the stone to make bubbles come out instead so that Gamora doesn't die. Since Nebula has a camera-like memory video thing since her body is mostly machine, Thanos knows that Gamora knows where the Soul Stone is, and he continues to torture Nebula until Gamora finally gives in and tells him where to find it. He takes Gamora with her and it turns out he has to kill someone he loves in order to get the stone, a soul for a soul. Gamora laughs because she doesn't think he loves anyone, but he ends up throwing her off the cliff and killing her in order to get the stone. Nebula also escapes and finds the rest of the Guardians. So now he has the Power Stone, the Reality Stone, the tesseract stone and the Soul Stone.
Back to Iron Man.. he and Spiderman are able to get Dr. Strange out after being captured and they land on another planet where they meet up with Nebula, Quill, Drax and Mantis. Thanos ends up coming to the same planet and finally gets the Time Stone. They all try hard to get the gauntlet off of Thanos, but they fail and he disappears off to earth.
Back on earth the rest of the avengers are in Wakanda trying to help Vision to heal. He has the last stone that Thanos needs. He comes to Wakanda with all his troops and then there's a big battle. Black Panther's sister is trying to help Vision, and Wanda leaves Vision's side to help with the battle. Vision ends up going to the battle too after Thanos' people find where he is. He tells Wanda to destroy the stone before Thanos can get to him, and she finally decides to do it knowing it will kill Vision. She destroys it killing Vision before Thanos can get to it, but because he has already gotten the time stone, he reverses time and pulls the stone from Visions head. Finally having collected all the stones, he snaps his figures and half the population dies.
If you've got through all that.. here's my opinion on it.. I did not like that the Avengers were never completely together the entire movie. I thought Thor's story of going to find a new weapon to destroy Thanos was so boring. I don't really like that there were so many different stories going on. And I don't like how Thanos collected all the stones in like ten minutes when he's been trying to get the stones for years.. However.. I did like the movie overall. I like that Quill and Wanda were willing to sacrifice the people they loved to save millions of others. I like the big battle at Wakanda and when Thor comes to help. And I like how sad it is at the ends when everyone just disappears and it's so sad..