At the end of episode 11 All Might showed up and this episode continues directly on. The fight is amazing and given what we know about All Might, full of unexpected tension. That said, the fight is literally the only thing that happens this episode as well as some ramblings from the villain about the basic understanding of what makes an act heroic or villainous but this is quickly shot down by All Might and we kind of just get back to hitting each other really hard. I am optimistic for the final episode and really would like to see Midoriya in action one last time (whether or not I get this remains to be seen).
My Hero Academia is available on AnimeLab.