I liked last nights episode a lot too, though some of that German was atrocious; I thought Crane had the best German of any of them!
I think the success of the show really belongs to Beharie, even taking into account the remarkable chemistry between the two leads. Mison has the easier role. He plays a fish out of water who gets to say silly things in his British accent. He does it well, but Beharie has a more difficult task. Like Gillian Anderson on the X-Files she must believe enough to continue on her journey, but must also retain enough skepticism to maintain credibility. She has to be tough, yet likable. Vulnerable to her sister's plight, but not weak. All while stopping the apocalypse. Another actress could have easily tanked the role and show, but she is great TV find so far this season.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!