4) Lieutenant Commander Deanna Troi: Michelle Dockery
This Downtown Abbey star will be a perfect replacement for Marina Sirtis as Counsellor Troi. She has great exotic looks, and her experience of dealing with a difficult mother will also come in handy.
5) Chief Miles O’Brien: Ewan McGregor
Ewan McGregor would make the perfect chief. He has the right attitude, right experience, and the right expression. The only point of contention is that McGregor is Scottish, while Miles was Irish. But we are ok with it, right?
6) Lieutenant Worf: Idris Elba
All those who have seen Luther will vouch for his screen presence. He is just too good an actor and can get into the skin of the character. Visualizing him with Klingon ridges actually mar his appearance, but times have changes, and maybe a prosthetic or a helmet can replace the ridges.