Anywhere with a good brief recap of season two to jog my memory? Or even of the last few eps?
Apparently titans have breached the second set of walls so they send scouts out to find the breach in the wall. Meanwhile Mike encounters the Beast Titan who can not only speak like a human, but is also able to control the mindless titans. He takes Mike's ODM gear and has the titans devour him. Later that night the scouts, being unable to find any holes in the wall, take refuge up in an old castle, Utgarde Keep. To their surprise, a large pack of titans, lead by the beast titan, attack the keep that night. As more scouts are getting killed, Ymir reveals she can turn into a titan and fights the mindless ones attacking the castle. Just before she is ripped apart by them an entire squad of scouts show up and clean up the rest of the titans.
Later that day after hoisting each other up onto the wall Reiner starts losing his mind and nonchalantly reveals that he and Bertholdt are the Armored and Colossal. Mikasa attempts to cut them down on the wall but hesitates and they transform and try to take Eren. He transforms into the Attack Titan and battles the Armored for a time while the rest of the scouts take on the slow and immobile Colossal stuck on the wall, but they can't touch him due to the immense steam being emitted. Eren outsmarts Reiner in the fight and right before he is able to extract Reiner from his titan form, the Colossal falls on them. Reiner and Bertholdt are able to extract Eren and injure him enough to kidnap him.
Once everyone else recovers and comes to they gather their energy and resolve and head to the tall forest where Reiner and Bertholdt have taken Eren and Ymir to heal up. They make a bargain with Ymir while Eren flails, armless, uncontrollably. Once the scouts make it to the forest the others take off with Eren while Ymir stays back and steals Historia(formerly Krista) before rejoining the other titan shifters who have hopped onto the Armored titans back as he leaves the other side of the forest. After a drawn out chase, the scouts catch up with them while Erwin, being the crazy bastard he is, leads a swarm of mindless titans right to the shifters to slow them down. Eventually they are able to get Eren away while Armin torments them by telling them Annie is being horrifically tortured inside the walls.
Eren and Mikasa, both injured, reunite and encounter the grinning feminine titan that consumed Eren's mother. Hannes takes the titan on in an attempt to avenge Eren's mother but is ultimately killed and eaten. Eren starts losing it because he is unable to transform due to the fact that he still recovering from his wounds. He ends up taking the titan on while in human form, striking the titans hand with his fist while screaming in rage. Suddenly something flips on in the countless mindless titans surrounding them all as they all go for the grinning titan. They consume it, leaving not a spot of flesh behind. The scouts start making their retreat while the Armored titan spots them and starts coming after them. Eren screams again and directs the titans at the Armored and Bertholdt. Ymir bails on Historia to go save the other shifters. It's later revealed that all 3 shifters survived, and that Reiner and Bertholdt will take Ymir back to their home.
Ah yeah and Erwin lost his arm.