My did Season 1 end with a cliffhanger, which I am gonna spoil because it's been what, 3 or 4 years(?) since it aired: Titans in the walls! Talk about a bombshell.
Attack on Titan comes back after a long wait with a very intense plot as we delve deeper into the AoT universe. So much is going that I have no idea where to start. Well, I can say that Season 2 carries on from where Season 1 ended with everyone who was fighting the Titans looking at the part of the wall which crumbled after Annie had grabbed it in her attempt to escape from Eren in his Titan form.