Now i will say this. when i first came out that this episode was going to be based around carters return to the show in flashback form and everything, there was a lot of rightful concern at first given that season 4 is in its final four episode leg of the season when the major story line of Samaritan should be ramping up and taking center stage. but when we really think this isn't the first time an episode that isn't nearly connected to the main Arch's is placed at a certain point of the season where you think it wouldn't be. so with that said Terra Incognita was an heartbreaking but amazing episode in the way it was acted by the wonderful Taraji P Henson and Jim Caviezal, the way it was shot which was a style of cinematography i have not seen the show really use before, to the soundtrack which was breathtaking in its right moments. I won't post spoilers but this episode was really great and might be one of the best of the season thats not connected to the main story. i can't ranking it higher then If-Then-Else or Prophets or Control-Alt-Delete, but its at least top five or six ( we must wait to see the last two episodes ). This is a emotional feel trip like no other.